Name: Spinach Mushroom Egg Cups
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Yield: 12
Ingredients: 8 ounces button or crimini mushrooms, sliced; 3 teaspoons olive oil (, divided); 1 yellow onion (, peeled, halved root to stem and thinly sliced into half moons); 4-5 cups fresh spinach; non-stick cooking spray; 1 teaspoon kosher salt; 1/2 teaspoon black pepper (freshly cracked); 1/2 teaspoon red pepper flakes (optional); 1 dozen eggs; 1 1/2 cups part skim shredded mozzarella; 4 tablespoons grated parmesan cheese