To get a domed muffin top, fill the liners all the way to the top and bake them at a high temperature (425°F/220°C) for 10 minutes. This creates enough hot air to puff up the muffin and set the tops without spreading outward. Reduce the temperature to 350°F/180°C and bake for an additional 8-11 minutes. This continues to bake the inside and prevents the outside of the muffins from burning. With this technique in mind, you'll have domed, professional looking muffins worthy of being in a bakery!