These homemade blueberry muffins with a streusel crumb topping are the best. They’re light, fluffy, and bursting with sweet berries. The crumbly topping takes it to another level of deliciousness.

Here is how to make these sourdough discard blueberry muffins with oat streusel topping. Step 1: Preheat oven. Preheat the oven to 425°F and line a standard 12-cup muffin tin with paper liners.