Sausage, Squash and Gruyere Frittata - I Feel Like Cooking

Ingredients

• 8 eggs
• 1 C yellow squash diced small
• 1 C zucchini squash diced small
• ¼ C thinly sliced white onion
• 1/3 C heavy cream
• ¼ t kosher salt
• ¼ t black pepper
• ½ t fennel salt
• 2 t fresh rosemary chopped finely
• ½ lb mild Italian sausage, removed from casings and browned
• ½ C grated gruyere cheese
• 3 T butter
• Parsley to garnish