Step 1

Steam asparagus crisp and tender, about 3 to 4 minutes. Thinly slice on the diagonal into 1/2-inch pieces.

Step 2

Preheat oven to 350°F.

Step 3

Heat butter in a 10-inch oven safe skillet over medium heat. Stir in shallots and saute until golden, about 4-5 minutes. Add steamed asparagus, salt and pepper.

Step 4

In a medium bowl whisk eggs, egg whites, grated cheese, salt, and pepper. Add the Swiss cheese and mix well.

Step 5

Add eggs to the skillet making sure eggs cover the asparagus. Cook on medium for about 4 minutes, until the edges begin to set.

Step 6

Move the skillet to oven. Cook about 16 to 18 minutes, or until frittata is completely cooked.

Step 7

Serve hot, cut into 4 equal wedges.