Cheeseburger Quiche

1 refrigerated piecrust (from a 15-oz. package)
1 lb. lean ground beef
1/4 c. ketchup
1 Tbsp. Worcestershire sauce
1 medium red onion, diced
2 packed c. baby spinach
1 c. grape tomatoes, halved
1/4 tsp. salt
1/4 tsp. pepper
5 large eggs
3/4 c. 2% milk
2 Tbsp. Dijon mustard
1 c. shredded sharp cheddar cheese

Heat oven to 400 degrees. Unroll crust and roll out slightly. Fit into the bottom and up the sides of a 9" deep [sic] pie dish. Flute edge. Line crust with nonstick foil. Bake at 400 degrees for 12 minutes. Remove foil.

Meanwhile, cook beef in a large nonstick skillet over medium-high heat, 5 minutes, breaking apart with a spoon. Spoon into a bowl and stir in ketchup and Worcestershire sauce.

In same skillet, cook onion for 5 minutes over medium heat. Add spinach and tomatoes; cook 3 minutes. Season with 1/8 tsp. of salt and 1/8 tsp. of pepper. Stir in beef.

Transfer beef mixture to crust. In medium bowl, whisk together eggs, milk, mustard, and remaining 1/4 tsp. salt and pepper. Sprinkle cheese over filling. Carefully add egg mixture. Bake at 400 degrees for 35 to 40 minutes. Let stand 5 minutes before slicing.

Serves 6.

From Family Circle magazine, Oct. 1, 2011, p. 184.