Preheat oven to 400F and line a baking sheet with foil or parchment (for easy clean up).
Melt butter in a small pan at medium heat. Add nuts to melted butter, reduce heat, and cook for ~ 3-4 minutes or until fragrant.
Remove pan from heat and stir in 1/8 - 1/4 tsp ground cinnamon.
Lay one sheet of defrosted puff pastry on a lined baking sheet and add an 8 ounce brie wheel to the middle.
Top with nut/butter mixture and add 1/4 cup brown sugar.
Wrap the pastry around it and gently press it together until it sticks.
Gently tie up excess dough with kitchen twine OR gently push the dough together and skip the twine.
Brush a beaten egg over any exposed pastry (this will help give it a nice brown crust).
Cook for 20-25 minutes or until golden brown.
Rest 20-30 minutes before serving. If you cut into this too soon, it will be a hot and yummy but a very runny mess.
Serve with sliced apples and crackers. Happy Eating! Beckie
Notes
Puff pastry usually comes frozen in a box of two - keep the other frozen for later and defrost the one you will be using.
ANYTHING tastes good cooked with brie in puff pastry. Throw some jelly or jam on there if you don't have the rest of the ingredients and bake according to instructions above.
Don't have walnuts? Skip it or try a different kind of nut.