1. Preheat the Oven:
- Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish.
2. Make the Sticky Sauce:
- In a small saucepan over medium heat, melt the butter. Add the brown sugar and heavy cream, and stir until smooth and bubbly.
- Remove from heat, stir in the vanilla extract, and pour the mixture evenly into the prepared baking dish. Sprinkle with chopped pecans, if using.
3. Prepare the Rolls:
- Slice the Hawaiian rolls in half horizontally, keeping the rolls attached. Place the bottom half in the baking dish on top of the sticky sauce.
- In a small bowl, mix the brown sugar and cinnamon. Brush the cut sides of the rolls with melted butter and sprinkle the cinnamon-sugar mixture generously over the bottom half of the rolls. Place the top half of the rolls back on top.
4. Bake the Sticky Buns:
- Cover the dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes, or until the tops are golden brown and the sticky sauce is bubbling.
5. Flip and Serve:
- Let the buns cool for 5 minutes, then carefully invert the baking dish onto a serving platter to let the sticky sauce coat the rolls. Serve warm.