Impossible Cheeseburger Pie

• 1 pound ground beef
• 1 large onion, chopped
• 1/2 teaspoon salt
• 1 cup shredded cheddar cheese
• 1/2 cup Bisquick baking mix
• 1 cup milk
• 2 eggs

Preheat oven to 400 degrees.
Spray 9-inch pie plate with cooking spray.
Cook beef and onion over medium heat, stirring occasionally, until beef is brown, drain.
Add salt, and spread in pie plate. 
Sprinkle with cheese.
Mix remaining ingredients until well blended.
Pour in pie plate.
Bake 25 minutes or until a knife inserted in center comes out clean.

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