Double-Layered Peanut Butter Cup Brownies

package fudge brownie mix (18.3 ounces or Family-Size for 9 x 13 pan)

Ingredients called for on the brownie mix

regular-sized Reese's peanut butter cups

and 1/2 cups milk chocolate chips

creamy peanut butter

vanilla extract

and 1/2 tablespoons shortening or coconut oil, (separated)