Creating Blueberry Oatmeal Muffins is a delightful experience when you follow these simple steps:

1. Preheat the Oven: Begin by preheating your oven to 375°F (190°C). Line a muffin tin with paper liners or spray with cooking spray.
2. Combine Oats and Buttermilk: In a bowl, mix the rolled oats and buttermilk. Let it sit for about 10 minutes to allow the oats to soften.
3. Mix Dry Ingredients: In a separate bowl, whisk together the flour, brown sugar, granulated sugar, baking powder, baking soda, salt, and cinnamon until well combined.
4. Beat Egg: In another bowl, beat the egg, then add the vegetable oil and vanilla extract. Mix thoroughly until blended.
5. Combine Mixtures: Add the wet oat mixture to the dry ingredients. Stir gently until just combined. Be careful not to overmix.
6. Fold in Blueberries: Gently fold in the blueberries, ensuring they are evenly distributed throughout the batter.
7. Fill Muffin Tins: Spoon the batter into the prepared muffin tins, filling each cup about ¾ full. Add a few extra blueberries on top for a beautiful presentation.
8. Bake: Place in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
9. Cool: Once baked, remove from the oven and let the muffins cool in the pan for 5-10 minutes before transferring them to a wire rack to cool completely.

Following these steps will allow you to create incredible Blueberry Oatmeal Muffins that everyone will love!