Step 1: Preheat the Oven - Start by preheating your oven to 350°F (175°C). This will ensure that your frittata cooks evenly.
Step 2: Whisk the Eggs - In a mixing bowl, combine the 8 egg whites and 1 whole egg. Whisk them together until fully blended and slightly frothy.
Step 3: Add Seasonings and Ingredients - Stir in the black pepper and salt to taste. Fold in the torn baby spinach, diced sun-dried tomatoes, and crumbled feta cheese.
Step 4: Heat the Skillet - Place your oven-safe skillet over medium heat and lightly coat it with a non-stick spray or a small amount of olive oil.
Step 5: Cook the Frittata Base - Pour the egg mixture into the skillet, spreading it evenly. Cook for about 5-7 minutes on the stove.
Step 6: Bake in the Oven - Transfer the skillet to the preheated oven and bake for another 10-15 minutes, or until the frittata is set in the center.
Step 7: Cool and Serve - Once cooked, remove the skillet from the oven and let it cool for a few minutes. Slice the frittata into wedges and serve warm or at room temperature.
