Follow these simple steps to create your Mini Beef Wellingtons flawlessly:

1. Preheat the Oven: Set your oven to 400°F (200°C) to ensure it is hot and ready for baking.
2. Sauté the Filling: In a large skillet, heat olive oil over medium heat. Add shallot and garlic, and sauté until soft, about 2 minutes.
3. Add Mushrooms and Beef: Stir in the chopped mushrooms and cook until they release their moisture and become golden brown. Season with salt, pepper, and thyme. Add the beef cubes, cooking until browned on all sides. This should take about 5-7 minutes.
4. Cool the Mixture: Remove from heat and set aside to cool slightly. Once cool, mix in the Dijon mustard.
5. Prepare Puff Pastry: On a lightly floured surface, roll out the puff pastry to about ¼-inch thickness. Cut into squares large enough to enclose each filling (approximately 4×4 inches).
6. Fill the Pastry: Place a spoonful of the beef filling in the center of each pastry square.
7. Wrap the Pastry: Fold the edges of the pastry over the filling to create a neat pocket. Pinch the edges to seal well.
8. Egg Wash: Brush the tops of each Wellington with a beaten egg to give them a golden-brown color when baked.
9. Place on Baking Sheet: Arrange the Wellingtons on a baking sheet lined with parchment paper.
10. Bake: Place the baking sheet in the preheated oven and bake for 25-30 minutes, or until the pastries are puffed and golden brown.
11. Rest the Wellingtons: Once baked, remove from the oven and let them rest for about 10 minutes to allow flavors to settle.

By following these steps, you’ll create beautiful Mini Beef Wellingtons that are both appetizing and flavorful. Your efforts in preparation will lead to a dish that brings smiles to the table!