Brush a round ovenproof dish, about 16cm across, with oil. How to make mini frittatas. Hi Sue, I'm so glad you picked this recipe, and I can guarantee it's my absolute favourite (and I'm Italian, so I grew up eating frittatas!). Preheat oven. Serve with salad and crusty bread. Preheat oven to 350°F and spray a non-stick or silicone muffin tin with nonstick spray. Tip everything into the dish. A thinner frittata cooks quicker. Ask a helper to put the dish in the oven for 30 minutes or until the egg is set. Pour the eggs into the other bowl and stir. Want to make a small frittata but don't have a little pan? Go ahead and use that large one, but be aware that the frittata will be thinner. Whisk eggs and add in remaining ingredients.