Preheat oven to 350°F and grease four 4-ounce ramekins and place them on a cookie sheet.
Combine 2 tsp. erythritol and 2 Tbsp. butter. Divide the mixture between the four ramekins.
With a stand mixer using the paddle attachment, cream the softened butter with the brown sweetener and vanilla.
While continuing to mix, add in eggs one at a time. Add the coconut flour, cocoa, baking powder, and Chocolate Toffee Keto Chow. Mix on low speed until combined.
Add 1/2 cup of batter into each ramekin.
Bake at 350°F for 30 minutes or until a toothpick inserted comes out clean.
To make the toffee sauce, melt the butter over medium heat in a medium saucepan.
Carefully pour in the heavy cream.
In the middle of the pan, add the sweetener. Do not stir. Let sit for 2 minutes so the sweetener will melt. (Waiting to stir prevents crystals of sugar on the sides, making a smoother sauce.)
Once the sweetener has melted, stir and turn off heat.
Run a butter knife around the ramekin to release the cooked cake from the sides. Turn the cake onto a serving plate and spoon toffee sauce over the cake. Best served right away while warm!