Mushroom and Smoked Gouda Puff

Directions

1. Preheat oven to 350°. In a large skillet, heat butter over medium-high heat. Add mushrooms and shallot; cook and stir until tender, about 5 minutes. Stir in thyme, salt and pepper.
2. Unfold puff pastry. Spread mushroom mixture to within 1 in. of edges. Sprinkle with cheese. Roll up jelly-roll style; pinch seam and ends to seal. Place on a parchment-lined baking sheet, seam side down. In a small bowl, whisk egg and water; brush over pastry. Cut slits in top.
3. Bake until golden brown, about 30 minutes. Let stand 10 minutes before cutting.