1 Heat the apple, cranberries, apple juice, maple syrup, and cinnamon in a saucepan over medium heat. Cover and simmer 10-12 minutes until the apples start to soften. Remove from heat.
2 Turn the broiler on. Place the naan on a baking sheet and spray them lightly on both sides with cooking spray. Heat them under the broiler about 1-2 minutes on each side until lightly toasted. Remove the baking sheet from the oven and arrange the brie slices on the naan. Return it to the oven for another 30 seconds until the brie starts to melt.
To assemble the crostini, cut each naan into 4 pieces. Place a spoonful of the apple cranberry mixture on each piece and top with some chopped walnuts. Garnish with thyme and serve.