Step 1

Preheat the oven to 400 degrees F. Spray 9-inch pie plate with non-stick cooking spray.

Step 2

Cook ground beef in a large skillet until it starts to brown. Drain any excess grease. Stir in 1/2 teaspoon of salt, 1/2 teaspoon of ground black pepper, and diced onion. Stir and cook for another 3-4 minutes.

Step 3

Pour beef mixture into prepared pie plate. Top with shredded cheese.

Step 4

In a separate bowl, whisk together eggs, milk, Bisquick, ground mustard, 1/2 teaspoon salt, and 1/2 teaspoon ground black pepper.

Step 5

Pour the mixture over cheese and beef. Bake for 25-30 minutes or until the top starts to turn golden brown.

Step 6

Let cool for 10 minutes before slicing.