Preheat the oven to 325 degrees F.
Whisk the first 8 ingredients together and set aside.
Add the eggs, Half & Half, vanilla extract and chocolate stevia to a stand mixer and blend on high until incorporated.
Pour in the dry ingredients and blend again.
Melt the butter ad chocolate together in the microwave for 1-2 minutes and stir until it is smooth.
Add a small amount to the mixer and blend on low. Continue to add until it's all absorbed and well mixed.
Line a 12 capacity cupcake pan with cupcake liners and spray with olive oil cooking spray.
Evenly add the batter to each cup.
Bake for 23-25 minutes or until a toothpick in center comes out clean.
Allow to cool completely before frosting.
Add the frosting ingredients to a stand mixer and blend on high until smooth.
Scoop out about a tablespoon from the center of each cupcake. Add frosting to a piping bag and add to the scooped out center and on top of each cupcake.
Keep refrigerated until ready to serve.