Making Mini Beef Wellingtons is a fun process that yields fantastic results. Follow these simple steps to create your own delicious creations:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Prepare the Beef: In a skillet over medium-high heat, add 1 tablespoon of olive oil. Once hot, season the beef cubes with salt and pepper and quickly sear for about 2-3 minutes until browned but not fully cooked. Remove from heat and let it cool.
3. Cook the Mushrooms: In the same skillet, add another tablespoon of olive oil. Add the chopped mushrooms and cook over medium heat until all moisture has evaporated, about 8-10 minutes. Stir in the thyme, Worcestershire sauce, and Dijon mustard. Cook for another 2 minutes, then remove from heat and let cool.
4. Prepare Pastry: On a floured surface, roll out the puff pastry sheets to about ¼ inch thick. Cut each sheet into squares or rectangles large enough to wrap around the filling.
5. Assemble the Wellingtons: Place a spoonful of the mushroom mixture onto the center of each pastry square. Top with a piece of beef. If using pâté or foie gras, layer a slice on top of the beef.
6. Wrap and Seal: Fold the pastry over the filling, sealing the edges by pressing down with your fingers or a fork. Make sure they are sealed well to prevent leaking.
7. Egg Wash: Place the wrapped Wellingtons on a baking sheet lined with parchment paper. Brush each one with beaten egg to achieve a golden color when baked.
8. Bake: Bake in the preheated oven for about 25-30 minutes, or until golden brown and puffed. Keep an eye on them to ensure they don’t burn.
9. Cool Slightly: Once out of the oven, let them rest for a few minutes before serving.

Follow these instructions carefully, and your Mini Beef Wellingtons will turn out to be a delicious success!