Pleasing Potato Pizza

Ingredients

• 3 large potatoes, peeled and cubed
• 1 tube refrigerated pizza crust
• 1/4 c. milk
• 1/2 tsp. salt
• 1 lb. diced bacon, diced
• 1 large onion, chopped
• 1/2 c. chopped sweet red pepper
• 1 1/2 c. shredded Cheddar cheese
• 1 1/2 c. shredded Mozzarella cheese
• sour cream (optional)