Low Carb Reduced Fat Shepherds Pie

1 lb Extra Lean Ground Beef
 1 medium cooking onion, diced
1 can of mushrooms (Chopped and drained)
1 beef bouillon cube
1 can of Peas and Carrots (Drained)
1 head of Cauliflower (Boiled, strained and mashed)
1/4 cup egg whites
1 Tbsp 95% Fat Free Herb and Garlic Cream Cheese

1. In a large, non stick skillet, on medium heat, cook Extra Lean Ground Beef and onions for approximately 5 minutes.
2. Add mushrooms and beef bouillon cube. Cook until meat is browned through.
3. Transfer meat mixture to the bottom of a square glass oven dish. (If excess fat noted in the pan, strain the mixture before transferring it to the oven proof dish).
4. layer meat mixture with the peas and carrots.
5. In a large bowl, mix together mashed cauliflower, herb and garlic cream cheese (optional), and egg whites. Season with salt and pepper to taste.
6. Layer the cauliflower on top of the peas and carrots.
7. Bake at 350 degrees for 30 minutes.