As a kid, I loved doughnuts filled with custard or jelly. So I decided to experiment with fillings in muffins. The result was this terrific recipe. These fancy muffins are almost like a pastry with a creamy center and a nutty streusel topping. -John Montgomery, Fortuna, California

Editor's Note: If using regular-size muffin cups, bake for 20-25 minutes.