In a small saucepan over low heat mix brown sugar, light corn syrup, heavy cream, and butter. Cook and stir praline sauce over medium heat for about 10 minutes until smooth and thick. Stir in vanilla extract and it is ready to serve .
For the grilled peaches:
Dip your finger into the cooled off praline sauce and rub each peach half lightly with the sauce. Preheat grill to medium/ high heat. Cook peaches face down on grill until they soften and have grill marks around 3 minutes. Take off the grill and allow to cool down slightly.
For the Sundaes:
Place peach half face up and top with Butter Brickle or vanilla ice cream, Praline Sauce, toasted pecans, whipped cream and a cherry!