Bisquick Ham and Cheese Casserole Recipe: Easy Make-Ahead Breakfast

Bisquick Ham and Cheese Impossible Casserole

This Bisquick ham and cheese casserole turns cooked ham, shredded cheese, eggs, milk, and baking mix into a filling breakfast or brunch dish with very little assembly. The ingredients go directly into a pie plate or baking dish, then a thin Bisquick batter is poured over the top. As the casserole bakes, the batter fills the spaces between the ham and cheese and forms a tender base with a lightly browned surface.

Although it is often called a Bisquick dump casserole, the finished texture is closer to a crustless quiche than a conventional bread-based breakfast casserole. There is no separate crust to roll or prebake, and no bread needs to soak before cooking.

The casserole can be prepared partly in advance. For the best texture, layer the ham, cheese, and green onions in the baking dish the night before, cover and refrigerate them, then mix and add the batter shortly before baking. A fully assembled casserole can be refrigerated overnight, but the Bisquick absorbs liquid as it sits and may produce a softer, denser result.

Bisquick Ham and Cheese Casserole Recipe

Yield: 6 servings
Preparation time: 15 minutes
Cooking time: 35 to 40 minutes
Resting time: 5 to 10 minutes
Total time: 55 minutes to 1 hour 5 minutes
Course: Breakfast, brunch, or main dish
Cuisine: American
Oven temperature: 400°F (about 200°C)

Equipment

• 10 1/2-inch oven-safe pie plate or 8-by-8-inch baking dish
• Medium mixing bowl
• Whisk
• Measuring cups and spoons
• Knife and cutting board

Ingredients

• 1 1/2 to 2 cups diced cooked ham, about 225 to 300 grams
• 1 cup shredded Swiss cheese, cheddar cheese, or a combination, about 4 ounces or 115 grams
• 1/3 cup chopped green onions, optional
• 1 cup Original Bisquick mix, about 120 grams
• 2 cups milk, 475 milliliters
• 4 large eggs
• 1/4 teaspoon fine salt
• 1/4 teaspoon ground black pepper

Instructions

1. Heat the oven and prepare the dish.
   Heat the oven to 400°F (about 200°C). Lightly grease a 10 1/2-inch pie plate or an 8-by-8-inch baking dish. Coat the bottom and lower sides so the egg mixture releases cleanly after baking.

2. Add the filling.
   Spread the diced ham evenly across the bottom of the dish. Scatter the shredded cheese over the ham, followed by the green onions, if using. Break apart any clumps of cheese so the filling is evenly distributed.

3. Make the Bisquick batter.
   Place the Bisquick, milk, eggs, salt, and black pepper in a medium bowl. Whisk until the eggs are fully incorporated and no large pockets of dry baking mix remain. Small lumps are acceptable.

4. Pour the batter over the filling.
   Slowly pour the batter across the entire dish rather than pouring it into one spot. The mixture will settle around the ham and cheese. A few pieces may remain visible at the surface.

5. Bake until set.
   Bake for 35 to 40 minutes. The top should be lightly golden, the edges should look firm, and the center should no longer ripple when the dish is moved gently. A knife inserted near the center should come out without wet egg mixture. Melted cheese on the knife is normal. For an additional doneness check, an egg casserole should reach 160°F (71°C) in the center.

6. Rest before serving.
   Let the casserole stand for 5 to 10 minutes. Resting gives the egg mixture time to finish setting and makes the casserole easier to cut into clean portions.

Can You Make It the Night Before?

The safest and most reliable overnight method is to prepare the filling and batter separately.

Place the ham, cheese, and green onions in the greased baking dish, cover it tightly, and refrigerate it. Measure the Bisquick and seasonings into a covered bowl if desired, but wait to add the milk and eggs. In the morning, whisk the liquid batter, pour it over the cold filling, and bake.

This method preserves the intended texture because the baking mix does not sit in liquid for several hours. Bisquick contains flour, starch, fat, and leavening. Once it is mixed with milk and eggs, the dry ingredients begin absorbing moisture. Extended refrigeration can make the batter thicker and may reduce the light, tender character that distinguishes an impossible casserole from a standard baked egg dish.

If the casserole must be fully assembled overnight

A fully assembled casserole can be covered and refrigerated overnight, provided it stays at 40°F (4°C) or colder. Expect a somewhat denser texture and less separation between the soft crust and egg filling.

Before baking, keep these points in mind:

• Bake the casserole while it is still cold rather than leaving raw eggs and milk on the counter for an extended period.
• A chilled casserole may require several additional minutes in the oven.
• Judge doneness by the center, not by the clock alone.
• Avoid moving a refrigerator-cold glass dish directly into a hot oven unless the manufacturer specifically states that it is safe. Sudden temperature changes can cause some glass bakeware to break. Metal is the least troublesome choice for an assembled overnight casserole.
• If using ceramic bakeware, follow the manufacturer’s directions regarding temperature changes.

The partially prepared method saves most of the morning work without compromising the consistency of the batter.

Ingredient Choices That Affect the Result

Ham

This recipe is particularly useful for leftover baked ham, but deli ham and packaged diced ham also work. Cut the meat into pieces no larger than about 1/2 inch so every serving contains a reasonable amount.

Very wet ham can release liquid into the casserole. Pat packaged ham dry if moisture collects on its surface. If using glazed holiday ham, trim away heavily sugared edges. A small amount of glaze is harmless, but too much may make parts of the casserole unusually sweet or prone to darkening.

Ham and cheese are both salty, so the added salt may be reduced or omitted when using a strongly cured ham.

Cheese

Swiss cheese gives the casserole a mild, nutty flavor that pairs well with ham. Cheddar makes it sharper and more familiar as a breakfast casserole. Combining the two provides some of the flavor of Swiss with the stronger color and tang of cheddar.

Other cheeses that melt well can be substituted, including Monterey Jack, Colby, Gruyère, or a mild provolone. Very moist fresh cheeses are less suitable because they can release water during baking. A strongly aged or salty cheese should be used in moderation so it does not overwhelm the ham.

Freshly grated cheese tends to melt more evenly, but packaged shredded cheese is acceptable for this recipe.

Milk

Whole milk produces a slightly richer casserole, while 2 percent milk also works well. Lower-fat milk may yield a softer, less rich filling. Unsweetened plain nondairy milk can work, but its flavor and thickening behavior vary by product. Avoid vanilla-flavored or sweetened milk.

Green onions and other additions

Green onions add a mild onion flavor without requiring sautéing. They may be omitted, especially when serving children or anyone who prefers a plain ham and cheese filling.

A small amount of diced bell pepper or well-drained cooked vegetables can be added, but vegetables with a high water content need preparation first. Mushrooms, spinach, zucchini, and frozen vegetables should be cooked and drained before they go into the dish. Excess moisture can prevent the center from setting properly.

Keep additions modest. Crowding the dish with several cups of vegetables or meat changes the ratio between filling and batter and can extend the baking time substantially.

Why the Casserole Forms Its Own Crust

An impossible-style casserole does not create a crisp pastry shell. The term “crust” refers to the firmer layer that develops as the thin baking-mix batter settles around and beneath the filling.

During baking, the eggs coagulate, the starches in the Bisquick absorb liquid and set, and the leavening contributes some lift. Cheese and ham remain suspended through much of the filling, while the exposed surface browns. The result usually has three loosely defined textures: a tender base, a custard-like center, and a browned top.

Those layers will not be perfectly uniform. The shape and material of the pan, the size of the ham pieces, and the distribution of the cheese all affect how the batter settles. A metal pan often browns the edges more readily than ceramic or glass.

Avoiding a Wet or Rubbery Casserole

A wet center usually has one of three causes: the casserole needs more time, the filling released excess moisture, or the proportions were changed. Check the center with a knife or instant-read thermometer before removing the dish from the oven. If the top is already brown but the middle remains loose, cover the dish loosely with foil and continue baking.

A rubbery casserole has generally baked too long. Egg mixtures continue to set during the resting period, so the dish does not need to become completely rigid in the oven. Remove it when the center is set but still looks moist.

Accurate pan size also matters. A smaller, deeper dish requires more time for heat to reach the center. A much larger dish spreads the batter thinly and can cause the edges to overcook before the expected baking time has elapsed.

For clean slices, allow the full resting period. Cutting immediately releases steam and can make a properly baked casserole appear underdone.

Serving the Casserole

For breakfast or brunch, serve the casserole with fresh fruit, roasted potatoes, or a simple green salad. At dinner, steamed green beans, roasted asparagus, or a vinegar-dressed cabbage salad offsets the richness of the ham and cheese.

A spoonful of mustard, hot sauce, or salsa can be added at the table. Strong condiments are better served separately because their flavors may not suit every portion, and some sauces add enough liquid to soften the casserole.

Six servings are appropriate when the casserole is accompanied by side dishes. For a larger meal or a brunch buffet, the dish may be cut into smaller squares.

Storage, Reheating, and Freezing

Cool leftovers promptly, transfer them to a covered container, and refrigerate within two hours of serving. Properly refrigerated egg casseroles are best used within three to four days.

Individual portions can be reheated in the microwave. Cover loosely and heat in short intervals so the edges do not become tough before the center is hot. For several portions, place them in a covered baking dish and warm in a 325°F (165°C) oven until the center reaches 165°F (74°C).

The cooked casserole can also be frozen, although the egg filling may release a little water after thawing. Cool it completely, cut it into portions, and wrap each piece tightly before placing it in a freezer-safe container. Thaw overnight in the refrigerator before reheating. Freezing the raw batter is not recommended because separation and changes in the baking mix can produce an uneven texture.

A Practical Make-Ahead Plan

For an easy morning meal, grease the baking dish and layer the ham, cheese, and green onions the night before. Cover and refrigerate. Measure the dry ingredients separately, then whisk them with the milk and eggs while the oven heats. Pour the freshly mixed batter over the filling and bake until the center reaches 160°F (71°C).

That approach keeps morning preparation brief while preserving the texture that makes a Bisquick ham casserole distinctive. The finished dish has the convenience of a dump-and-bake recipe, uses leftover ham efficiently, and needs no bread layer or separate pastry crust.