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Preheat your oven to 325 degrees F. Line a baking sheet with parchment paper. Set aside.
- Shift the all-purpose flour, cake flour, baking powder, and baking soda in a medium sized bowl.
- Add the salt and whisk together. Set aside.
- In a stand mixer, mix the unsalted butter, vanilla extract, brown sugar, and granulated sugar on medium speed for 2 minutes. Butter and sugar should be all incorporated together into like a paste.
- Add the whole egg and egg yolk and beat on low for 30 seconds.
- Next, still on low, incorporate the flour mixture in three separate batches. About 30 seconds each batch. Do not over beat. Only beat till flour is mixed in.
- Stir in chocolate chips and chopped walnuts. Just stir a few seconds.
- Put the cookie dough into the fridge for about 20 minutes.
- After, remove from fridge and use a cookie or ice cream scooper to form the balls. *use a scale if you want the cookies to the same size. Mine weighed 50 grams each.
- Place each ball of dough onto a baking tray lined with parchment paper. Do not over crowd the balls. *I put about 8 balls on each baking sheet.
- Bake for 12 minutes at 350 degrees F. *every oven is different so around 10 minutes check to see if the edges are getting too burnt. If it does happen then turn off the oven, but leave the cookies inside for about 3-4 minutes to let the middle bake thoroughly.
- Don’t worry if it is soft in the middle when you touch it. Let stand for 10 minutes and if will continue to harden to a chewy texture.
*can make about 16 medium size cookies