This recipe uses both coconut sugar and maple sugar in the crumble topping to keep it refined sugar–free and naturally sweetened. These sugars give a rich, caramel-like flavor, but they tend to soften at room temperature.
If you prefer a crunchier topping that holds up longer, replace either the coconut sugar or the maple sugar with granulated sugar. Granulated sugar caramelizes and hardens slightly as it bakes, creating a crisp texture that lasts. For best results, allow the muffins to cool completely before storing, and keep them loosely covered—too much trapped moisture can soften the topping.
Coconut sugar and maple sugar naturally contain more moisture and have a lower melting point than granulated sugar. While they add depth of flavor, they absorb humidity from the air over time, which is why the crumble topping made entirely with them will soften more quickly.











