Food & Cooking Recipes Breakfast & Brunch Recipes Mostly Greens Frittata 5.0 (1) Close Credit: Bryan Gardner Prep Time: 5 mins Total Time: 17 mins Servings: 4 Spinach and Swiss chard work equally well in this good-for-you egg dish. Directions Melt butter in an 8-inch cast-iron skillet. Add garlic; cook until soft, 1 minute. Add spinach; heat through. Season whisked eggs with salt and pepper. Add to skillet and cook, pushing eggs into center to create curds, until almost set, 3 minutes. Sprinkle with Gruyere. Bake at 400 degrees until set and golden, 12 minutes.