Melt the chocolate chips and butter over low heat on the stove or microwave for 1-2 minutes and stir until completely smooth. Set aside.
Preheat oven to 350 degrees F. Grease an 8 inch spring form pan and place onto a small baking sheet pan.
Add the oil, eggs, yolk, vanilla extract, stevia and cream to a stand mixer and mix until combined.
Slowly pour in the melted chocolate while the mixer is on low speed.
Add the remaining ingredients and blend until combined.
Stir in the optional chocolate chips if desired.
Pour batter in pan and bake for 30 minutes. Allow to cool completely before proceeding.