- If using leftover noodles, bring them to room temperature. If cooking fresh, boil noodles according to package directions, drain, and toss with a little oil to prevent sticking. Set aside. 
- In a large bowl, whisk together eggs, milk or cream (if using), salt, and pepper. Stir in vegetables, cheese, and protein of your choice. Add herbs or spices if desired. 
- Heat 2–3 tablespoons of oil or butter in a large non-stick skillet over medium heat. Spread the noodles evenly across the pan and press down lightly to form a flat layer. Cook for 4–5 minutes until the bottom is golden and crispy. 
- Pour the egg mixture evenly over the noodles. Reduce heat to low, cover, and cook for 8–10 minutes until the edges are set and the center is almost firm. 
- If the top is still runny, either place the skillet under a broiler for 1–2 minutes (if oven-safe) or carefully flip the frittata by sliding it onto a plate, inverting it back into the skillet, and cooking 2–3 more minutes. 
- Slide the finished frittata onto a board, slice into wedges, and garnish with herbs, green onions, or a drizzle of soy sauce or hot sauce. Serve warm.