Step 1

Place a rack in the center of your oven and preheat the oven to 375 degrees F. Line a baking sheet with parchment paper or a silicone baking mat.

Step 2

In a medium bowl, whisk together the whole wheat flour, all-purpose flour, baking soda, baking powder, salt, and cinnamon.

Step 3

In the bowl of a stand mixer fitted with the paddle attachment or a large mixing bowl, cream the butter for 30 seconds. Add the sugar and beat on medium speed until light and fluffy (1 to 2 minutes). Scrape down the bowl once or twice as needed.

Step 4

Add the egg. Beat on medium-low speed, just until blended.

Step 5

On low speed, beat in the maple syrup and vanilla.

Step 6

With the mixer on low, slowly add the dry ingredients, stopping as soon as they disappear.

Step 7

Switch to a rubber spatula or wooden spoon. By hand, stir in the oats and mix-ins, until evenly distributed.

Step 8

Portion the dough by 1.5 to 2 tablespoonfuls, shape into a ball (each ball will be about 1 1/2 inches across), and place on the baking sheet, leaving 2 inches of space between the cookies.

Step 9

Bake for 8 to 9 minutes, until the tops are BARELY golden. The centers will still seem soft and underdone (they will set up more as they cool. Do not overbake!). Let the cookies cool on the baking sheet for 1 minute, then carefully transfer to a wire rack to finish cooling. Repeat with the remaining cookies, letting the sheet cool completely between batches. Enjoy!