Hot Italian Sausage and Broccoli Rabe Frittata

INGREDIENTS

1 lb

broccoli rabe, tough stem ends removed

3/4 lb

hot Italian sausage, loose or in links

2 tbsp

extra-virgin olive oil

medium onion, diced

Salt and black pepper

3 cloves

garlic, minced

2 tsp

roughly chopped rosemary

1 1/2 cups

ricotta

3 oz

grated provolone (about 1 1/4 cup)

3 oz

grated Parmesan (about 3/4 cup)

4 oz

grated smoked mozzarella (about 1 1/2 cup)

eggs, lightly beaten and seasoned with salt and pepper