Heat oven to 350.
grease a 13 x 9 baking dish
In a small saucepan over low heat, cook the ketchup with the brown sugar, stirring until sugar dissolves.
Dry the water chestnuts with paper towels.
Wrap one small slice of bacon tightly around each chestnut then secure with a toothpick.
Place into baking dish
lightly cover the dish with foil.
Bake for about 35-40 mins or just until the bacon is crispy. You can uncover and cook a little longer to crisp the bacon more.
Remove from oven and drain the grease.
drizzle the sauce mix over each chestnut and return to oven uncovered for 8-10 mins more.