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.
1. Preheat oven to 350o F. Lightly grease a standard muffin pan and set aside. 2. Make the streusel topping. In a small bowl, whisk together the chopped pecans, sugar, salt and cinnamon.