Preheat your oven to 350°F (175°C).

Lightly grease a 9×13-inch baking dish.

In a skillet over medium heat, cook the ground beef until browned.

Drain any grease and add taco seasoning and water. Simmer until thickened.

Stir in tomatoes and onions. Cook another 2–3 minutes, then remove from heat.

Press the biscuit dough into the bottom of your baking dish, overlapping as needed to form a solid crust.

Spoon the beef mixture over the biscuit layer.

In a separate bowl, mix sour cream, mayo, and 1 cup of cheddar cheese.

Spread this creamy mixture evenly over the beef layer.

Sprinkle remaining cheddar cheese on top.

Bake uncovered for 25–30 minutes, or until the cheese is bubbly and golden, and the biscuits are cooked through.

Let rest 5 minutes before slicing and serving.