Banana & Walnut Streusel Muffins

These banana muffins, topped with a little streusel mixture, are the easiest you’ll ever make. Streusel is essentially the same as a crumble topping, made up of oats, flour, sugar and butter. The crumbly texture of the streusel meets the moist muffin to create a delightful bite! The riper the bananas the better here, even as far as fully brown, as these are sweeter and add a richer flavour.