Description

This comforting Prime Rib & Broccoli Cheese Casserole is the perfect way to give leftover prime rib new life. Tender chunks of beef, crisp broccoli, and a rich, creamy cheese sauce come together to create a hearty dish that’s both satisfying and simple to prepare. Perfect for family dinners, potlucks, or cozy nights at home, this casserole delivers the warmth of homemade comfort food with an easy, fuss-free approach.

Ingredients

Scale

3 cups cooked prime rib, diced or shredded
4 cups broccoli florets, fresh or frozen (thawed)
2 cups shredded cheddar cheese, divided
1 cup Monterey Jack cheese, shredded
1 cup sour cream
1 can (10.5 oz) cream of mushroom soup
1 teaspoon garlic powder
½ teaspoon onion powder
½ teaspoon smoked paprika (optional)
½ teaspoon salt, or to taste
¼ teaspoon black pepper
1 tablespoon butter
1 ½ cups crushed Ritz crackers or plain breadcrumbs
¼ cup melted butter (for topping)

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Instructions

Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with nonstick spray or butter.
If using fresh broccoli, bring a pot of salted water to a boil. Add broccoli florets and cook for 2–3 minutes until just tender. Drain and rinse with cold water. If using frozen broccoli, thaw completely and pat dry.
In a large bowl, mix the cream of mushroom soup, sour cream, 1½ cups cheddar cheese, Monterey Jack cheese, garlic powder, onion powder, smoked paprika, salt, and pepper. Stir until smooth and creamy.
Add the diced prime rib and blanched broccoli to the mixture, gently folding until everything is evenly coated.
Transfer the mixture to the prepared baking dish, spreading it evenly. Top with the remaining ½ cup cheddar cheese.
In a small bowl, combine crushed Ritz crackers (or breadcrumbs) with ¼ cup melted butter. Mix until coated. Sprinkle the topping evenly over the casserole.
Bake uncovered for 25–30 minutes, or until the casserole is bubbling around the edges and the topping is golden brown.
Remove from the oven and let it cool for 5–10 minutes before serving. This helps the sauce thicken and makes serving easier.

Notes

To make the most of leftover prime rib, trim excess fat and bring it to room temperature before using.
Substitute cream of mushroom soup with cream of chicken or homemade white sauce for a different flavor.
For added color and nutrition, mix in cauliflower, carrots, or peas.
Use freshly shredded cheese for the best melt and creamy consistency.
Assemble the casserole a day ahead, refrigerate, and bake when ready — adding 10 extra minutes to the bake time.
Store leftovers in an airtight container in the refrigerator for up to 3 days or freeze for up to 2 months.
Reheat individual portions in the microwave or bake in the oven at 350°F until warmed through.

Prep Time: 20 minutes
Cook Time: 30 minutes