Tex-Mex Mashed Potato Casserole

Preheat oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
In a large pot, boil the cubed potatoes in salted water until fork-tender, about 15–20 minutes. Drain thoroughly.
Mash the potatoes with butter, sour cream, milk, garlic powder, salt, and pepper until smooth and creamy. Spread evenly into the bottom of the prepared baking dish.
In a mixing bowl, combine ground beef with egg, breadcrumbs, chili powder, cumin, onion powder, salt, and pepper. Mix until just combined and form into small meatballs (about 1 to 1½ inches in diameter).
In a skillet over medium heat, brown the meatballs on all sides for about 6–8 minutes, until mostly cooked through.
Arrange the browned meatballs on top of the mashed potatoes. Evenly distribute corn and black beans over the meatballs.
Sprinkle shredded pepper jack cheese generously over the top.
Bake uncovered for 15–18 minutes, or until cheese is melted and bubbling and meatballs are fully cooked.
Let the casserole rest for 5 minutes before serving. Garnish with chopped cilantro, if using.

Spicy Upgrade: Add chopped jalapeños or a dash of cayenne pepper to the mashed potatoes.
Cheese Mix: Use a blend of cheddar, Monterey Jack, or a Mexican cheese mix instead of pepper jack.
Vegetarian Version: Replace meatballs with plant-based alternatives or spiced roasted veggies like bell peppers and zucchini.
Southwest Style: Layer in sautéed onions and bell peppers with the corn and beans for extra flavor.
Taco-Inspired: Mix taco seasoning into the meatball mixture and serve with a side of salsa or guacamole.

Smooth Potatoes: For extra creamy mashed potatoes, use a potato ricer or beat with a hand mixer.
Make Ahead: Assemble the casserole up to a day in advance and bake just before serving.
Even Meatballs: Use a small cookie scoop to portion meatballs for consistent cooking.
Customize Toppings: Add sliced olives, crushed tortilla chips, or diced tomatoes after baking for a festive touch.
Reheating: Leftovers can be reheated in the oven or microwave. For best texture, reheat covered with foil at 350°F for 15–20 minutes.

Tex-Mex Mashed Potato Casserole is a colorful, filling, and flavorful way to break free from the usual dinner routine. It’s comfort food with a kick.