1/3CupGruyere Cheese, grated (you could also use cheddar, parmesan or any other cheese you love)
Instructions
Preheat oven to 350 degrees.
Heat the 1 Tbsp of the oil or butter in a large saute pan with an ovenproof handle and cook the vegetables for 5 minutes.
Combine the vegetables in a bowl with the mashed potatoes, eggs, salt and cheese.
Heat 1 tbsp of the oil or butter over medium/high heat in the same large saute pan and add the egg/potato mixture.
Cook over medium heat for 5 minutes or until the bottom is set (no need to stir).
Bake for 25 minutes or until cooked through.
Change the oven setting to broil (heat from the top of the oven) and cook an additional 2-3 minutes of until golden on top of the frittata (make sure to watch it carefully so it doesn’t burn).