Add the butter, cream, and brown sugar to a pot over medium-high heat. Bring to a boil, boil for two minutes.

Remove from heat, stir in the peanut butter and vanilla until combined.

Add the powdered sugar, stir until combined (if it starts to clump, return to heat until just starting to melt.

Line an 8x8 pan with parchment, pour the peanut butter into the pan in an even layer, chill until set, about 1 hour.

In a microwave-safe bowl add the chocolate chips and beer (this can also be done in a double boiler), heat for 30 seconds, stir and repeat until melted and well combined.

Pour over the peanut butter layer in an even layer. Top with mini peanut butter cups.

Chill until set. Cut into cubes to serve.