Do not brown. Pour over the spinach. Heat the oil in a 10-inch ovenproof nonstick skillet over medium heat. Combine the eggs and cottage cheese in a food processor and puree until the mixture is very smooth. Arrange the tomato slices on top. How To Make Spinach Frittata. Add half of the spinach and cook until wilted down, about 1 minute. Return skillet to medium-high heat, add spinach and saute just briefly until it has wilted, about 15 - 30 seconds, transfer spinach to plate with bacon. Sprinkle on the Adobe spice. All of the ingredients are mixed together along with egg and seasonings, poured into a cast iron skillet and then baked in the oven. Add the shallot and cook, stirring frequently, until softened, 3 to 4 minutes. Sprinkle on the grated cheese. Pack the spinach on the bottom of the dish. Add the sliced onion. This Spinach Frittata recipe is loaded with tasty ingredients – tomato, spinach, and swiss cheese are in every bite. In a large mixing bowl whisk together eggs, half and half, onion powder, garlic powder until well combined.