Skinny Broccoli and Cheddar Quiche

INGREDIENTS

6 oz

pie crust (9-inch, refrigerated)

2 tsp

olive oil

1/2 cup

red onion (chopped)

1 1/4 cups

part-skim ricotta cheese

1 cup

fat free cheddar cheese

large egg

large egg whites

1 tbsp

Dijon mustard (regular mustard will work as well)

1 tsp

dried oregano

1/2 tsp

salt (or more to taste)

1/4 tsp

black pepper (or more to taste)

10 oz

frozen chopped broccoli (thawed and well-drained)

2 tbsp

grated Parmesan cheese (split)