1-Preheat oven to 375°F and lightly spray a 9×13-inch casserole dish with nonstick cooking spray.

2-In a medium bowl, mix the cheddar bay biscuit mix, seasoning packet, and 3/4 cup cold water until just combined. Spread the dough evenly across the bottom of the casserole dish. If sticky, spray hands with cooking spray and gently press down.

3-Bake at 350°F for 5-8 minutes until the dough is set. Remove and set aside.

4-In a large skillet over medium heat, cook ground beef and diced onion, breaking up meat until browned and cooked through. Drain excess grease if needed. For tips on browning meat, visit this guide on cooking ground beef.

5-Stir in taco seasoning, 1/4 cup water, fire-roasted diced tomatoes, and diced green chilies. Simmer for 2-3 minutes, stirring occasionally.

6-Spread beef mixture evenly over the partially baked biscuit crust.

7-In a small bowl, combine mayonnaise, sour cream, and 1 cup shredded cheese. Spread this evenly over the beef layer.

8-Sprinkle remaining 1 cup shredded cheese on top.

9-Bake casserole for 30 minutes until the top is melted and bubbly. Let cool for 5 minutes.

10-Garnish with dried parsley flakes before serving.