Preheat Oven:
Preheat your oven to 350ºF (175ºC) and lightly grease a 9×13-inch baking dish with non-stick spray.
Cook the Beef and Vegetables:
In a large skillet or pan over medium-high heat, cook the ground beef, diced red bell pepper, and diced onion until the meat is browned and the vegetables are softened, about 6-8 minutes. Drain off any excess grease.
Season the Beef Mixture:
Stir in the taco seasoning packet and season with salt and pepper to taste. Set aside.
Prepare the Sour Cream Mixture:
In a medium bowl, whisk together the sour cream, mayonnaise, 1 cup of shredded cheddar cheese, diced green chiles, and garlic powder until well combined. Set aside.
Prepare the Biscuit Base:
In a separate bowl, combine the biscuit mix with 1 cup of water. Mix until a soft dough forms, adding a little more water if necessary to reach the right consistency.
Pre-bake the Biscuit Base:
Press the dough evenly into the bottom of the greased baking dish. Place the dish in the preheated oven and bake for 5-7 minutes, or until the biscuit base is lightly golden.
Assemble the Casserole:
Remove the baking dish from the oven. Spread the cooked beef mixture evenly over the biscuit layer. Top with the fire-roasted diced tomatoes with green chiles, spreading them out in an even layer.
Add the Sour Cream Mixture and Cheese:
Spread the sour cream mixture over the layer of tomatoes. Sprinkle the remaining 3/4 cup of shredded cheddar cheese on top.
Bake the Casserole:
Return the baking dish to the oven and bake for 30 minutes, or until the casserole is warmed through and the cheese is melted and bubbly.
Serve:
Remove the casserole from the oven and let it cool for a few minutes. Serve hot, and enjoy your delicious taco casserole!
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