Preheat oven to 375 degrees.
Whisk eggs and heavy cream.
Add sautéed mushrooms to the egg mixture. Set aside.
Melt the 2 tablespoons of butter in the nonstick skillet over low heat. Once the butter has melted, swirl around in the pan to cover the surface. Turn heat off.
Add egg mixture to pan. Sprinkle grated fontina cheese over egg mixture. Using a fork, distribute the cheese evenly.
Evenly add crumbled herbed goat cheese over top. Bake in oven for 25-30 minutes or until golden on top.
Cut into slices and serve hot or at room temperature