I have quite a few blueberry muffin recipes on my blog. Blueberry Cream Cheese Muffins and Blueberry Breakfast Cake and Blueberry Banana Banana Bread with Brown Butter Glaze.
Preheat oven to 350°F. Spray or butter a cast iron skillet.
Heat oven to 425°F. (or just increase the temperature if your oven is already on)