Place Brie cheese in the freezer for 20 minutes. Oil a mini muffin pan with cooking spray.
Roll 1 puff pastry sheet out into a 10×14-inch rectangle. Cut the sheet lengthwise into 4 even strips and crosswise into 6 even strips; there should be 24 squares. Separate and press them gently into the muffin cups.
Cut chilled Brie cheese into 24 pieces approximately 3/4-inch in size. Add 1 teaspoon cranberry sauce to each pastry-lined muffin cup; press in 1 piece of Brie and top with 1 teaspoon of chopped walnuts. Sprinkle bites with sea salt. Chill for at least 30 minutes and up to 3 days.
Preheat oven to 400 degrees F (200 degrees C).
Bake bites in the preheated oven until golden brown, 18 to 20 minutes.
Placing the Brie cheese in the freezer for 20 minutes makes it easier to cut.
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