Frittata with Fresh Greens

Preheat oven to 350°. Wash fresh greens; chop lightly. Slice leeks or onions into rounds. Melt 2 Tbsp of the butter in an oven-safe skillet and sauté over medium heat until just tender. Add the fresh greens and cover the pan to steam 1-3 minutes, until wilted. Meanwhile, mix together the eggs with the milk or cream. Add a sprinkle of salt and pepper. Melt the remaining butter in the pan. Pour the egg mixture over and allow to cook over low heat for 1-2 minutes (without stirring). Sprinkle the cheese on top and transfer to the oven. Bake until the eggs are set and the cheese is starting to bubble, about 5-10 minutes. Serve with a fresh salad and crusty bread.