- Preheat oven to 350ºF and line two 9-inch square baking pans with parchment paper overlapping the sides. In a medium mixing bowl, whisk together flour, brown sugar, cinnamon, sea salt and baking powder. In a separate large mixing bowl, beat together butter, peanut butter, eggs and vanilla extract until smooth using a hand mixer.
- Gradually mix dry ingredients into wet until dough is crumbly. Continue mixing using hands until dough is moist. Divide into two equal pieces. Press dough into pans using hands. Bake for 20-22 minutes. Cool in pans completely for 1 hour. In the meantime, leave ice cream out at room temperature for 20-30 minutes to soften.
- Carefully lift one of the cookie layers from pan and set aside. Scoop ice cream onto the other cookie layer in pan and spread evenly with a spatula.
- Combine ⅓ cup peanut butter and sesame oil. Stir until smooth. Drizzle over ice cream and sprinkle peanuts on top. Use spatula to swirl peanut butter into ice cream.
- Remove cookie layer from parchment paper and place on top of ice cream layer with the smooth bottom facing up. Press gently. Freeze for 4 hours or overnight. Slice into 12 bars and enjoy right away or store in freezer in an airtight container.