PREHEAT OVEN TO 400F.
ADD GROUND BEEF AND ONION TO A LARGE SKILLET AND COOK UNTIL BEEF IS BROWNED AND ONION IS SOFTENED. DRAIN GREASE. SPREAD MIXTURE IN A 9-INCH GREASE PIE PAN.
SPRINKLE CHEESE OVER MEAT.
ADD MILK, ONION SOUP MIX, BISQUICK AND EGGS TO A MEDIUM BOWL AND WHISK TOGETHER TO COMBINE. POUR MIXTURE IN PIE PLATE.
BAKE FOR 25 MINUTES. LET COOL A FEW MINUTES BEFORE SERVING.