These muffins don't need a crumb topping! Crumb toppings are great for some muffins like these u003ca href=u0022https://zestforbaking.com/banana-oatmeal-muffinsu0022u003ebanana oatmeal muffinsu003c/au003e but in the true spirit of keeping them refine sugar free, no crumb topping is needed.