Step 1

Preheat oven to 425 degrees F. Coat an 8-inch-square (or similar-size) metal baking pan with cooking spray.

Step 2

Whisk mustard, oil, lemon juice, salt and pepper in a small bowl.

Step 3

Cut pears in half lengthwise, hollow out the core and slice a small piece off the other side so they will lie flat when served. Brush all over with the mustard glaze and place cored-side down in the prepared pan.

Step 4

Bake the pears for 30 minutes, basting halfway through with the glaze. Gently turn them over, baste again and place a piece of Brie in the hollow of each pear. Bake until the pears are tender and the Brie is slightly softened, 3 to 5 minutes. Sprinkle each pear half with 1 teaspoon pistachios.