While the bacon is cooking, prepare the other ingredients for your cheeseburger bowls. Mix the ground beef, chopped mushrooms, salt, pepper, and garlic powder in a small bowl. Shred the cheese and chop the rest of the burger toppings.
1 pound lean ground beef, 2 button mushrooms, 1 teaspoon salt, 1 teaspoon black pepper, 1 teaspoon garlic powder, ½ cup cheddar or other cheese, 1 avocado, lettuce