Cattle Drive Casserole

Name: Cattle Drive Casserole
Cook time: 1 h
Total time: 1 h
Cuisine: American, TexMex
Ingredients: 1 1/2 pounds ground beef; 1 (10 oz.) can fire-roasted diced tomatoes with green chiles; 1 (4 oz.) can diced green chiles; 1 (1.25 oz.) packet taco seasoning; 2 1/2 cups biscuit mix; 1 3/4 cups sharp cheddar cheese, shredded, divided; 1 red bell pepper, diced; 1/2 yellow onion, diced; 1 cup water; 1/2 cup sour cream; 1/2 cup mayonnaise; 1 teaspoon garlic powder; kosher salt and freshly ground pepper, to taste