Mushroom, Sage, and Apple Puff Pastry Tart, with a Honey Mustard Sage Cream Sauce - I Feel Like Cook

Ingredients

• 12 oz. sliced baby bells mushrooms
• 1 large, sweet apple like Fuji or Gala, peeled and small diced
• 4 T OliveThis! Wild Mushroom Sage oil divided
• 1+ t kosher salt and more for sprinkling before baking (A also used a coarse pink sea salt for garnishing the tart before cooking.)
• 1 T thinly sliced (julienned) fresh sage leaves
• 6 large fresh sage leaves
• 5 T butter divided
• 1 sheet puff pastry, thawed