- Heat the butter in a large skillet over medium heat.
- Add the sliced onions and cook for 10–15 minutes, stirring occasionally, until caramelized and golden brown. Remove from the skillet and set aside.
Step 3: Brown the Ground Beef
- In the same skillet, cook the ground beef over medium heat until browned and fully cooked. Drain any excess grease.
- Season the beef with garlic powder and black pepper.
Step 4: Combine the Ingredients
- In a large mixing bowl, combine the cooked ground beef, caramelized onions, cooked rice, French onion soup, cream of mushroom soup, and sour cream.
- Mix until well combined.
Step 5: Assemble the Casserole
- Transfer the mixture into the prepared baking dish.
- Sprinkle the mozzarella cheese, Parmesan cheese, and breadcrumbs (if using) evenly over the top.
Step 6: Bake
- Bake in the preheated oven for 25–30 minutes, or until the casserole is bubbling and the top is golden brown.
Step 7: Serve
- Let the casserole rest for 5 minutes before serving.
- Garnish with fresh parsley if desired, and serve hot with a side salad or crusty bread.
Why You’ll Love This Recipe
- Comfort Food Classic: Combines rich, savory flavors in one dish.
- Family-Friendly: A meal everyone will love.
- Easy to Prepare: Perfect for busy weeknights or meal prepping.
Pro Tips
- Boost the Flavor: Add Worcestershire sauce or a splash of soy sauce to the ground beef for extra depth.
- Vegetable Option: Stir in some sautéed mushrooms, peas, or spinach for added nutrition.
- Storage: Store leftovers in an airtight container in the refrigerator for up to 3 days, or freeze for later.
This French Onion Ground Beef and Rice Casserole is a cozy, satisfying dish that’s sure to become a regular in your dinner rotation. 🧅🍲✨