Refrigerate:
Let the casserole cool completely, then cover the baking dish tightly with foil or transfer slices into an airtight container. Store in the refrigerator for up to 4 days. To reheat, pop individual servings in the microwave or warm the entire dish in a 350°F oven until heated through.
Freeze:
Want to save some for a rainy day? This casserole freezes beautifully. Once cooled, portion into freezer-safe containers or wrap tightly in plastic wrap and foil. Store in the freezer for up to 3 months. Thaw overnight in the fridge before reheating, or reheat straight from frozen (add extra time and cover with foil to avoid drying out).
VARIATIONS AND SUBSTITUTIONS:
Swap the meat: Ground turkey or chicken work great in place of beef.
Change the cheese: Try pepper jack for a kick or mozzarella for extra melt.
Low-carb option: Use mashed cauliflower instead of potatoes.
Add veggies: Stir in sautéed mushrooms, spinach, or bell peppers for extra flavor.
Make it spicy: Add jalapeños or hot sauce to the meat mix.
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