Step 1

Combine flour, baking powder, baking soda, and salt; set aside.

Step 2

In a stand mixer, cream butter and brown sugar together until creamy, about 2 minutes. Add in your egg and vanilla and mix until fully combined.

Step 3

Turn the mixer speed to low and slowly add the flour mixture. Once combined add in rolled oats, chocolate chips, and walnuts (if using).

Step 4

Using a 1/4 cup measuring, measure out cooking dough and place it onto the prepared cookie sheet 2 1/2 inches apart.

Step 5

Bake until cookies start to set around the outside edges but the center still seems soft about 12-15 minutes, be sure to rotate the baking sheets halfway through the cooking process.

Step 6

Allow cookies to cool on the baking sheet for 5 minutes before transferring them to a cooling rack.