Impossible Cheeseburger Pie (Wheat Free)

Ingredients

• 1lb Lean Ground Beef
• 1 1/2 cups Chopped Onion
• 1 1/2 cups Milk or Water
• 3 Eggs
• 3/4 cup Wheat Free Biscuit & Baking Mix
• 1/4 tsp Ground Black Pepper
• 1/2 tsp Sea Salt
• 2 Medium Tomatoes - Sliced
• 1 cup Grated Lowfat Cheddar Cheese