Introduction
Welcome to your new favorite weeknight dinner solution!
This bubbly, golden-brown Ground Beef and Bell Pepper Casserole combines savory seasoned beef, sweet bell peppers, tomatoes, onions, and plenty of melted cheese in one comforting dish.
It is easy to prepare, budget-friendly, and perfect for busy weeknights, family dinners, and meal prep.
Recipe Overview
| Detail | Information |
| Prep Time | 15 minutes |
| Cook Time | 30 minutes |
| Resting Time | 5 minutes |
| Total Time | 50 minutes |
| Servings | 6–8 |
| Difficulty | Easy |
| Category | Dinner |
Why You’ll Love This Recipe
This easy casserole delivers plenty of flavor without requiring complicated preparation.
The savory ground beef pairs beautifully with sweet red bell peppers, aromatic onion, garlic, and tomatoes.
A generous layer of mozzarella and cheddar melts over the top, creating a bubbly, golden cheese crust.
It also stores and reheats well, making it an excellent option for weekly meal preparation.
Ingredients
Beef and Vegetable Mixture
| Ingredient | Quantity |
| Ground beef | 1½ lb |
| Red bell peppers, diced | 2 large |
| Yellow onion, diced | 1 medium |
| Garlic cloves, minced | 3 |
| Crushed tomatoes | 1 can (15 oz) |
| Dried oregano | 1 teaspoon |
| Olive oil | 1 tablespoon |
| Salt | ½ teaspoon, or to taste |
| Black pepper | ½ teaspoon |
| Smoked paprika | ½ teaspoon |
Cheese Topping
| Ingredient | Quantity |
| Mozzarella cheese, shredded | 1½ cups |
| Sharp cheddar cheese, shredded | ½ cup |
| Fresh parsley, chopped | 1 tablespoon |
Step-by-Step Instructions
Prepare the Oven
Preheat your oven to 190°C (375°F).
Lightly grease a 9 × 13-inch baking dish with cooking spray or a small amount of olive oil.
Cook the Vegetables
Heat the olive oil in a large skillet over medium-high heat.
Add the diced onion and red bell peppers.
Cook for approximately 5 minutes, stirring occasionally, until the vegetables begin to soften.
Brown the Beef
Add the ground beef and minced garlic to the skillet.
Break the beef apart with a spatula.
Cook for approximately 6–8 minutes, stirring occasionally, until the beef is thoroughly browned.
Drain excess fat if necessary.
Add the Tomato Sauce
Stir in the crushed tomatoes, oregano, smoked paprika, salt, and black pepper.
Reduce the heat to medium-low.
Allow the mixture to simmer for approximately 5 minutes, stirring occasionally.
Taste and adjust the seasoning if needed.
Assemble the Casserole
Transfer the beef and vegetable mixture into the prepared baking dish.
Spread it evenly across the dish.
Sprinkle the shredded mozzarella over the top.
Add the cheddar cheese evenly over the mozzarella.
Bake
Place the uncovered casserole in the preheated oven.
Bake for approximately 20 minutes, or until the cheese is completely melted, bubbling, and lightly golden around the edges.
Rest and Garnish
Remove the casserole from the oven.
Allow it to rest for 5 minutes.
Sprinkle the chopped fresh parsley over the top.
Slice and serve warm.
Best Tips
Cook the bell peppers until they begin to soften before assembling the casserole. This helps create a better final texture.
Drain excess fat from the beef if needed to prevent a greasy casserole.
Freshly shredded cheese usually melts more smoothly and creates a creamier topping.
Do not overbake the casserole, as the cheese can become dry.
Allow the casserole to rest for a few minutes before serving for cleaner portions.
Best Ingredient Options
Ground Beef
An 85/15 ground beef blend provides a good balance of flavor and moisture.
Bell Peppers
Red, orange, and yellow bell peppers all work beautifully and provide natural sweetness.
Cheese
Mozzarella gives the casserole a stretchy, creamy topping, while sharp cheddar adds a stronger savory flavor.
Tomatoes
Crushed tomatoes create a smooth sauce that coats the beef and vegetables without making the casserole overly watery.
Recipe Variations
Cheesy Beef and Rice Casserole
Stir 2 cups of cooked white rice into the beef mixture before transferring everything to the baking dish.
Spicy Beef Casserole
Add ½–1 teaspoon of crushed red pepper flakes or diced jalapeños to the beef mixture.
Mushroom Beef Casserole
Sauté 1 cup of sliced mushrooms with the onions and bell peppers.
Extra Cheesy Casserole
Add an additional ½ cup of mozzarella before baking for an even richer cheese topping.
Italian-Style Beef Casserole
Add 1 teaspoon of Italian seasoning and a little grated Parmesan to the cheese topping.
What to Serve With
Serve this casserole with a crisp garden salad tossed with lemon vinaigrette.
Warm garlic bread is another excellent choice for soaking up the flavorful tomato sauce.
You can also serve it with roasted broccoli, green beans, or steamed vegetables for a balanced family dinner.
Make-Ahead Instructions
Prepare the beef and vegetable mixture and transfer it to the baking dish.
Allow it to cool, then cover the dish tightly and refrigerate for up to 2 days.
When ready to bake, add the cheese topping and place the casserole in a preheated oven.
Because the ingredients will be chilled, you may need to add approximately 5–10 minutes to the cooking time.
Storage
Allow leftovers to cool before transferring them to an airtight container.
Refrigerate for up to 4 days.
Reheating
For individual portions, microwave on high for approximately 60–90 seconds, or until heated through.
For the entire casserole, cover the baking dish with foil and reheat at 175°C (350°F) for approximately 20 minutes, or until hot in the center.
Freezing
This casserole can be frozen for up to 3 months.
For best results, allow the casserole to cool completely before wrapping it securely for freezer storage.
Thaw overnight in the refrigerator before reheating.
If freezing before baking, assemble the beef mixture and cheese topping, cover tightly, and freeze.
Common Mistakes to Avoid
Using Watery Vegetables
Cook the bell peppers and onions briefly before assembling to help remove excess moisture.
Not Seasoning the Beef
Season the beef while cooking so the entire casserole has a flavorful base.
Cutting the Peppers Too Large
Dice the peppers into relatively small, uniform pieces so they soften evenly.
Overbaking
Keep an eye on the cheese during the final minutes. You want it melted, bubbly, and golden rather than dry or burned.
Serving Immediately
Allowing the casserole to rest for about 5 minutes makes it easier to serve.
Nutrition Estimate
Nutrition values are approximate and depend on the exact ingredients and portion sizes.
| Nutrient | Approximate Amount per Serving |
| Calories | 385 kcal |
| Protein | 32 g |
| Carbohydrates | 9 g |
| Fat | 24 g |
| Fiber | 2–3 g |
| Sodium | Varies |
Frequently Asked Questions
Can I use another type of ground beef?
Yes. You can use a leaner or slightly higher-fat ground beef depending on your preferred texture and flavor.
How do I prevent the casserole from becoming watery?
Cook the peppers and onions before assembling the casserole and allow the tomato mixture to simmer for several minutes.
Also, drain excess fat from the cooked beef when necessary.
Can I add rice?
Absolutely. Stir 2 cups of cooked rice into the beef mixture before adding the cheese.
Can I make it spicy?
Yes. Add crushed red pepper flakes, diced jalapeños, or your favorite hot sauce to the beef mixture.
Can I add more vegetables?
Definitely. Mushrooms, zucchini, spinach, or additional bell peppers can be added to the mixture.
Can I prepare it ahead of time?
Yes. Assemble the casserole up to 2 days ahead and keep it refrigerated until ready to bake.
Final Thoughts
This Cheesy Ground Beef and Bell Pepper Casserole is the kind of comforting, easy dinner that deserves a regular place in your weekly meal rotation.
Tender ground beef, sweet bell peppers, savory tomatoes, and bubbling melted cheese come together in one simple baking dish.
Serve it with a fresh salad and warm garlic bread for an easy, satisfying family dinner that everyone can enjoy.