Craig's Kitchen - Sweet Potato Shepherd's Pie

A southern version of Shepherd's pie using Sweet Potatoes.
Ingredients:
3 medium or 2 large Sweet Potatoes, peeled
1/2 cup Water, divided
1 tbsp Butter
1 medium Onion, chopped
2 cloves Garlic, minced
1 lb Lean Ground Beef
1/4 cup All Purpose Flour
1 1/2 cups Milk, divided
1 Beef bouillon Cube or equivalent
1/2 tsp Ground Thyme
1 tbsp Chili Powder
1 cup chopped Bell Peppers
1 cup frozen Corn or Mixed Vegetables
Salt and Pepper to taste
1 Egg, beaten
Minced Green Union tops for garnish (optional)
Check video for procedure.