Hearty potato frittata is a satisfying vegetarian Italian comfort food. This high protein mediterranean family dish is fresh, filling, and ideal for a 1500 calorie or intermittent fasting plan.
Preheat the oven to 375°F. Peel and thinly slice the potatoes and onion for even cooking.
In a large oven-safe nonstick skillet, heat 1 tbsp olive oil over medium heat. Add sliced potatoes and onion; cook, stirring, for about 8–10 minutes until tender but not browned.
In a bowl, whisk together eggs, milk, Parmesan, kosher salt, black pepper, and chopped parsley to blend well.
Increase heat to medium-high and drizzle remaining 1 tbsp olive oil around the skillet edge. Spread the cooked potatoes and onion evenly, then pour the egg mixture over. Gently shake skillet to distribute eggs.
Reduce heat to low. Cook frittata on stovetop 5–6 minutes, until edges are mostly set. Transfer skillet to oven and bake 10–12 minutes, until puffed and center is just set. Rest for 5 min, slice, and serve warm or at room temperature.