Creating Blueberry Muffin Cookies is simple when you follow these easy steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. Combine Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
3. Cream Butter and Sugar: In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
4. Add Egg and Vanilla: Mix in the egg and vanilla extract until fully incorporated.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the wet mixture, stirring until just combined.
6. Fold in Blueberries: Gently fold the blueberries into the dough, being careful not to crush them.
7. Optional Oats: If using, fold in the rolled oats for added texture.
8. Scoop the Dough: Use a cookie scoop or tablespoon to drop dough onto the prepared baking sheet, spacing them about 2 inches apart.
9. Bake: Place in the oven and bake for 12-15 minutes or until the edges are lightly golden and the centers look set.
10. Cooling: Remove from the oven and allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Following these steps will have you savoring cookies that are soft, chewy, and packed with blueberry goodness in no time!