In medium bowl, mix crust ingredients; press in the bottom of an ungreased 13×0 baking dish (mixture will be thick). Bake 13 minutes. Cool completely, about 30 minute
In bowl of a stand mixer (or you can use a hand mixer), combine softened butter and peanut butter and mix until smooth. Add powdered sugar, vanilla, salt and half & half and mix until smooth and velvety. Spread evenly over cooled crust.
Place the chocolate chips in a medium size bowl. Microwave or heat the cream on the stovetop to a low simmer (a few small bubbles around the edges). Pour the cream over the chocolate chips. Let sit for 2 to 3 minutes then whisk to combine until smooth and glossy. Let cool slightly and then spread ganache over peanut butter filling.
Let stand at room temperature until bars are set, 2 to 3 hours.