Preparation

• Preheat the oven to 350 degrees. Line a baking sheet with parchment paper or a Silpat mat.
• In a large mixing bowl, use an electric mixer to beat the butter, coconut oil and sugar on high speed until the mixture is fluffy and light, about 5 minutes, scraping down the sides of the bowl as needed. Add the egg, egg yolk and vanilla and beat on medium speed until combined.
• Use a rubber spatula to mix in the oats, flour, flaxseed, baking powder, baking soda, cinnamon and salt until there are no streaks of flour left and a thick dough forms. Fold in the chocolate chips.
• Use a spoon or your hands to scoop about 2 tablespoons dough. Roll into a ball and place on the baking sheet. Repeat until all dough is used, leaving some space between the dough in case the cookies spread.
• Bake 12 to 14 minutes, until the edges are golden. Let cool completely before removing them from the pan.