Preheat oven to 400°F (200°C) and line baking sheet with parchment paper.

In a skillet, heat olive oil and 1 tbsp butter. Add steak, season with salt and pepper, sear until browned but not fully cooked. Remove and set aside.

Sauté onions, garlic, and mushrooms in remaining butter until softened.

Sprinkle flour over vegetables, stir to combine, then gradually add beef broth, cooking until thickened. Return steak, add Worcestershire sauce and herbs, cook 2–3 minutes.

Roll puff pastry on floured surface. Cut into 4-inch circles.

Place 1–2 tbsp filling in center of each circle. Fold and seal edges, brush with beaten egg.

Bake 20–25 minutes until golden brown. Cool 5 minutes before serving.