Classic Beef Wellington Recipe with Mushrooms - My Homemade Recipe

Ingredients

• 1 pound beef tenderloin.
• 2 tablespoons olive oil.
• 2 tablespoons yellow mustard.
• 1 pound mixed mushrooms.
• 4 slices ham or prosciutto.
• 1 sheet puff pastry, thawed.
• 2 large egg yolks.
• Kosher salt.
• Black pepper.
• Flaky salt.