1 1/2 cups ground chocolate graham crackers or chocolate wafer cookies (about 7 1/4 ounces)
5 tablespoons unsalted butter, melted
2 tablespoons (packed) golden brown sugar
2 tablespoons (1/4 stick) butter, melted
5 large eggs
1 teaspoon vanilla extract
1 cup brown sugar
2/3 cup heavy whipping cream
1 teaspoon vanilla extract (optional)
Pinch of salt
Directions:
1. In a small saucepan melt butter.
2. Add the brown sugar; whisk until combined and thickened (about 2 minutes).
3. Whisk in the whipping cream, until thoroughly blended (2 more minutes).
4. Mix in vanilla (if using) until combined.
5. NOTE: this sauce will thicken up more when refrigerated.
Let caramel come to room temperature. Spoon caramel over top of cake just to edges (do not allow to drip down sides). Garnish top edges with chopped Heath bars. Chill at least 2 hours or overnight.
Run knife around pan sides to loosen cake; release pan sides.