In large bowl, cream together butter, white sugar, and brown sugar until smooth. Beat in the egg, add vanilla. Dissolve baking soda in hot water, then add to batter, add salt, slowly stir in flour then chocolate chips. Press half of the cookie dough onto the bottom of an 8x8 pan. Set aside the other half.
Place the hershey chocolate bars onto the cookie dough layer.
In small bowl microwave peanut butter for 30 seconds until warm and melty then mix in powdered sugar until combined. Spread peanut butter mixture onto the chocolate bars.
Crumble the remaining cookie dough on top of the peanut butter covering as much as possible. (optional: sprinkle the top with a few more chocolate chips)
Bake for 22-28 mins or until the edges are golden brown and the middle is lightly golden. Cool before cutting and serving.
Recipe by THE SEMISWEET SISTERS at https://www.thesemisweetsisters.com/2016/07/14/chocolate-chip-cookie-buckeye-layer-bars/