Preheat oven to 350 degrees.
In a large mixing bowl add butter and sweetener.
Beat until creamed together.
Add eggs and whites, whisk until well incorporated.
Then add heavy whipping cream, apple cider vinegar, and vanilla. Blend well.
Add the dry mix to the wet and mix thoroughly to incorporate.
Place cupcake liners into your muffin pan and lightly coat with non-stick cooking spray in each liner.
Using an ice cream scoop to scoop equal amounts of batter into each cupcake liner.
Tap the tray on the counter to release any trapped air bubbles.
Bake at 350 degrees for 25 minutes.