Melt the butter in a 10-inch nonstick skillet (I use my Corningware skillet) over medium-high heat. Add the shallot and garlic and cook until softened, about 1 minute. Stir in the peas. Cover and cook until the peas are heated through, about 3 minutes. Season with salt and pepper to taste. Remove from heat and toss peas with fresh chopped mint. Serve.