Prepare Dinner as directed on package; spoon into 9-inch pie plate sprayed with cooking spray.
Whisk eggs and onions until blended; pour over Dinner.
Arrange bacon slices in lattice design on foil-covered rimmed baking sheet. Place in oven along with the frittata.
Bake 15 to 17 min. or until bacon is crisp, and eggs in center of frittata are set. Remove bacon from oven; cool slightly. Meanwhile, top frittata with Singles; bake 1 to 2 min. or until melted.
Transfer bacon to paper towel-covered plate with spatula; drain. Use paper towel to flip bacon over frittata; remove and discard paper towel.