Creating these delectable Ham & Cheddar Puff Pastry Bites is surprisingly easy and fun. Follow these simple step-by-step instructions to bake up a batch of golden, flaky goodness.

1. Preheat the Oven and Prepare Baking Sheet: Begin by preheating your oven to 400°F (200°C). This temperature is ideal for ensuring the puff pastry bakes up light and airy, achieving that signature flaky texture without burning. While the oven is preheating, line a large baking sheet with parchment paper. Parchment paper is crucial as it prevents the puff pastry bites from sticking to the baking sheet and makes for easy cleanup. If you don’t have parchment paper, you can lightly grease the baking sheet, but parchment is highly recommended for the best results.
2. Prepare the Puff Pastry: Gently unfold the thawed puff pastry sheet on a lightly floured surface. A lightly floured surface prevents the pastry from sticking and allows for easy rolling and cutting. If your puff pastry is still slightly cold, it will be easier to handle. Using a rolling pin, lightly roll out the puff pastry sheet to slightly enlarge it, about 12×12 inches. Rolling it out slightly helps to even out the thickness and makes it easier to cut into uniform squares. Be careful not to roll it too thin, as this can affect the puff and flakiness.
3. Cut the Puff Pastry: Using a sharp knife or a pizza cutter, cut the puff pastry sheet into equal squares. For appetizer-sized bites, aim for squares that are approximately 2 inches by 2 inches. You should get around 24 squares from a standard sheet of puff pastry. Uniform squares will bake evenly and look more appealing. A pizza cutter can make quick and clean cuts through the puff pastry.
4. Assemble the Puff Pastry Bites: Now it’s time to assemble the delicious filling into our puff pastry squares. Take each puff pastry square and place it on the prepared baking sheet. In a small bowl, if using, whisk together the Dijon mustard and a tablespoon of water to thin it slightly. Lightly brush a tiny amount of the Dijon mustard mixture (if using) onto each puff pastry square. This adds a subtle layer of flavor. Next, place a small amount of diced ham (about a teaspoon) in the center of each square. Top the ham with a generous pinch of shredded cheddar cheese. Don’t overfill the squares, as this can make them difficult to close and may cause the filling to spill out during baking. If using fresh herbs, sprinkle a few chopped herbs over the cheese at this stage.
5. Fold and Seal the Puff Pastry Bites: To create the signature bite shape, fold one corner of each puff pastry square over to the opposite corner, forming a triangle. Gently press the edges to seal them. You can use a fork to crimp the edges for a decorative look and to ensure a tight seal. Sealing the edges well is important to prevent the filling from leaking out and to help the pastry puff up nicely.
6. Egg Wash and Bake: In a small bowl, beat the egg with a tablespoon of water to create an egg wash. Brush the tops of each puff pastry bite with the egg wash. The egg wash gives the bites a beautiful golden-brown color and a glossy finish. Bake in the preheated oven for 15-20 minutes, or until the puff pastry is golden brown and puffed up, and the cheese is melted and bubbly. Keep an eye on them towards the end of the baking time to prevent them from burning. The baking time may vary slightly depending on your oven.
7. Cool and Serve: Once baked, carefully remove the Ham & Cheddar Puff Pastry Bites from the baking sheet and transfer them to a wire rack to cool slightly. Cooling them slightly allows the cheese to set and prevents you from burning your mouth. These bites are best served warm, when the puff pastry is still crisp and flaky, and the cheese is gooey and melted. Serve immediately and enjoy the delightful combination of savory ham, sharp cheddar, and flaky puff pastry!