Hamburger Pie

Ingredients

• 1 c. Bisquick
• 1/4 c. cold water
• 1 lb. ground beef
• 1/2 tsp. salt
• 1/2 Tbsp. oregano
• 1/4 tsp. pepper
• 1/2 c. bread crumbs
• 8 oz. tomato sauce
• 1/4 c. onion, finely chopped
• 1/4 c. green pepper, finely chopped
• 1 egg
• 1/4 c. milk
• 1/2 tsp. mustard
• 2 c. shredded Cheddar cheese (8 oz.)