Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper.

On a floured surface, unfold the puff pastry sheet. Using a rolling pin, gently roll across the surface of the pastry sheet two times.

“Gently is the key here. ….just flatten a tiny bit!

With the tines of a fork, poke holes in the puff pastry then brush with the melted butter. Sprinkle on the cheddar and the 1/2 cup Parmesan. Lightly press the cheese into the pastry using a rolling pen. Cut the pastry into rounds using a 1 1/2  inch round pastry cutter. Gently press 1 slice of jalapeños into the middle of each round. Transfer to the prepared baking sheets. Sprinkle over the remaining 1/2 cup Parmesan. Bake 10 minutes until the bites are golden brown and puffed.