In a medium mixing bowl, add all of the ingredients for the cake and blend until smooth.
Spread the mixture in the bottom of a well greased crockpot.
Cook on high for 2-3 hours until cooked through completely.
Let the cake cool to room temperature.
Melt the butter, brown sugar substitute and granulated sugar together in a saucepan over medium low heat on the stove.
Pour in the heavy whipping cream into the saucepan and whisk to combine.
Add in the egg yolks very slowly, whisking continuously as you do.
Remove from the heat. Stir in the vanilla, coconut flakes and pecans.
Let cool slightly, then top the cake with the mixture before serving.