Sweet and Savory Baked Brie

Name: Sweet and Savory Baked Brie
Ingredients: 1 tablespoon unsalted butter; 1 tablespoon extra-virgin olive oil; 1 small bulb fennel, diced (about 3/4 cup); 1 Fuji apple, peeled and chopped (about 1 heaping cup); 1 teaspoon granulated sugar; Pinch of kosher salt; 1 clove garlic, grated; 1 tablespoon chopped basil; 1 large egg; 1 sheet frozen puff pastry, thawed in the refrigerator; All-purpose flour, for dusting; One 8-ounce wheel Brie; Flaky salt, for garnishing; Sliced baguette, crackers or crudités, for serving