Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper.
Place the thawed puff pastry sheet on a lightly floured surface and roll it out to about 0.5 cm thickness, helping it relax and become evenly thin.
Use a pastry cutter or sharp knife to cut the dough into squares or circles, roughly 5 cm in size, creating a uniform shape for each bite.
Arrange the cut pastry pieces on the prepared baking sheet, leaving space between each for puffing.
Spread a small spoonful of caramelized onions and a sprinkle of chopped thyme onto the center of each piece, then top with a generous amount of smoked cheese and crumbled chorizo.
Beat the egg in a small bowl and brush the edges of each pastry with the egg wash, giving them a shiny, golden finish once baked.
Bake in the preheated oven for 15-20 minutes, until the pastries are puffed, golden, and crispy.
Remove from the oven and let them cool slightly on the baking sheet—this helps the layers set and makes them easier to handle.
Serve the savory puff pastry bites warm, accompanied by spicy mustard or aioli for dipping, and enjoy their flaky, cheesy, and spicy goodness!
