In a large bowl, whisk together the eggs, milk, salt, and pepper until well combined and slightly frothy.
Fry bacon in your 10-inch oven-safe skillet over medium heat. Remove once crispy and set aside.
In the same pan, fry the chopped onion and red bell pepper in the remaining bacon grease. fry for 5-7 minutes, or until the vegetables are softened.
Stir in the chopped baby spinach and cook for another 1-2 minutes, until it wilts down
Evenly scatter the crumbled feta cheese, chopped sun-dried tomatoes, and diced crispy bacon over the sautéed vegetables in the skillet.
Pour the whisked egg mixture over the vegetables, feta, and sun-dried tomatoes in the skillet. Gently shake the pan to ensure the egg mixture is evenly distributed.
Cook on the stovetop for 3-5 minutes, or until the edges of the frittata begin to set but the center is still liquid.
Carefully transfer the skillet to the preheated oven. Bake for 15-20 minutes, or until the frittata is puffed, golden brown, and set in the center. A knife inserted into the center should come out clean.
Remove the frittata from the oven and let it rest in the skillet for a few minutes before sliding it onto a cutting board. Garnish with fresh chives, if using.
Slice into wedges and serve warm or at room temperature.
Notes
Little Things That Make It Better
Use A Non-Stick, Oven-Safe Skillet: A 10-inch pan is ideal. Cast iron works beautifully, but a good non-stick will keep things extra gentle.
Don’t Overwhisk The Eggs: A light hand keeps the texture soft and custardy—not spongy.
Let It Cool Slightly Before Slicing: This helps the frittata set and makes slicing clean and easy.
It’s Even Better The Next Day: Frittata keeps well in the fridge and can be enjoyed cold or gently reheated.
Make It Yours: Swap in mushrooms, zucchini, goat cheese, or herbs you love. It’s flexible, forgiving, and always lovely.