Line muffin tin with paper liners.
Mix graham crumbs, butter, and sugar until texture resembles wet sand.
Press 1 tablespoon crust into each liner and freeze.
Beat softened cream cheese until smooth.
Add peanut butter and blend until creamy.
Add powdered sugar, vanilla, and salt; beat lightly.
Fill liners with mixture and smooth tops.
Melt chocolate chips with cream in 20-sec intervals.
Stir in butter until glossy; cool 2 minutes.
Spoon ganache over bites (½ tablespoon each).
Freeze at least 2 hours or overnight.
Serve chilled or store in freezer up to 3 months.