Step 1

Preheat oven to 375°.

Step 2

In a large mixing bowl, beat butter 30 seconds until creamy.

Step 3

Add brown sugar, granulated sugar, baking powder, baking soda, cinnamon, and salt. Mix until combined.

Step 4

Beat in eggs and vanilla until combined.

Step 5

Mix in flour; stir in oats.

Step 6

Refrigerate dough 30 minutes; divide in half and add frozen blueberries to half at a time.

Step 7

Scoop dough into 2 Tbsp. size balls; place 2 inches apart on an ungreased cookie sheet.

Step 8

Bake at 375° for 15 minutes or centers are completely set and cookies are golden brown.

Step 9

Cool 10-15 minutes on cookie sheet; remove to wire rack to cool completely.