Chocolate Peanut Butter Pretzel Cheesecake Bars

For the pretzel crust::

pretzels, crushed into fine crumbs (about 1 1/2 cups crumbs)

unsalted butter, melted

brown sugar

semisweet chocolate chips

For the cheesecake::

cream cheese, at room temperature

light brown sugar

large eggs, at room temperature

smooth peanut butter

vanilla extract

salt

For the chocolate peanut butter ganache::

heavy cream

semisweet chocolate chips

smooth peanut butter