Step 1

Preheat oven to 300°F and line a large baking sheet(s) with parchment paper.

Step 2

Cream butter, granulated sugar, and brown sugar in the bowl of a stand mixer on medium speed for about 2 minutes. (Use a hand mixer, food processor, or a fork/whisk if you don't have a stand mixer.)

Step 3

Add the egg, vanilla, and lemon juice, blending with mixer on low speed for 30 seconds, then medium speed for about 2 minutes, or until light and fluffy, scraping down bowl.

Step 4

With mixer on low speed, add the flour, protein powder, oats, baking soda, and cinnamon, mixing for about 45 seconds. Don’t over mix.

Step 5

Remove bowl from mixer and fold in the chocolate chips and walnuts.

Step 6

Portion the dough into 15 balls weighing ~45 grams each onto the baking sheet about 2" apart.

Step 7

Bake for 20 to 23 minutes, or until edges are golden brown and center is still soft.