Marbled chocolate biscuits (Print Version)

# Ingredients:

01 - 1/2 cup unsalted butter, softened.
02 - 1/2 cup granulated sugar.
03 - 1/2 cup brown sugar.
04 - 1 egg.
05 - 1 teaspoon vanilla extract.
06 - 1 1/2 cups all-purpose flour.
07 - 1/2 teaspoon baking soda.
08 - 1/4 teaspoon salt.
09 - 1/2 cup cocoa powder.
10 - 1/2 cup peanut butter.

# Instructions:

01 - Set your oven to 350°F and line a baking sheet with parchment paper.
02 - Beat butter with the sugars first, then mix in the egg and vanilla extract.
03 - Stir together the flour, salt, and baking soda. Mix them slowly into the wet ingredients.
04 - Split the dough in two. Add peanut butter to one part and cocoa powder to the other half.
05 - Roll dough into marbled balls by combining both halves slightly, then bake for 10-12 minutes.

# Notes:

01 - The cookies should be soft in the middle when you take them out of the oven.
02 - Let them cool on the tray before moving them.