In a large skillet over medium heat, add the lean ground beef. Cook until browned, breaking it apart with a wooden spoon as it cooks. This should take about 5-7 minutes.
Once the beef is cooked through, drain any excess fat. Sprinkle the taco seasoning over the beef and stir to combine. Add the tomato sauce and enchilada sauce, mixing everything together until well-combined. Allow it to simmer for about 5 minutes.
While the beef mixture is simmering, open the cans of refrigerated biscuits. Cut each biscuit into quarters. This will allow them to soak up all the delicious flavors while baking.
In your oven-safe casserole dish, pour the beef mixture evenly across the bottom. Then, scatter the biscuit pieces over the top of the beef mixture.
Sprinkle the Mexican cheese blend generously over the biscuit pieces. This will melt and create a delicious cheesy topping as it bakes.
Preheat your oven to 375°F (190°C). Place the casserole dish in the oven and bake for 25-30 minutes, or until the biscuits are golden brown and cooked through. The cheese should be bubbly and slightly browned.
Once baked, remove the dish from the oven and allow it to cool for a few minutes before serving. Enjoy your Beef Enchilada Bubble Up warm, garnished with your favorite toppings like sour cream, guacamole, or fresh cilantro!