Spinach Frittata - Once Upon a Chef

Ingredients

• 2 tablespoons extra virgin olive oil
• ¾ cup thinly sliced shallots, from 2 to 3 shallots
• 5 oz baby spinach (about 5 packed cups)
• ½ teaspoon salt
• 8 large eggs
• ⅓ cup heavy cream
• ¼ teaspoon freshly ground black pepper
• ¾ cup shredded Cheddar cheese
• ½ cup Parmigiano Reggiano
• ¼ cup fresh chopped basil