Preheat oven to 350F.
Grease a 13x9-inch pan.
Blend the browned butter and the peanut butter until smooth. Add the eggs one at a time.
Add the sugars and vanilla extract and beat until the batter is no longer grainy.
Stir in the flour.
Carefully stir in the pretzels and peanut butter cups.
Bake for 30 minutes or until just done.
Remove from the oven.