Preheat oven to 425 degrees F. Add butter (or coconut oil) to bundt pan and place in oven and allow to preheat. The butter will brown but this will not negatively affect the cake. The pan should preheat for at least 10 minutes but no more than 15 minutes. Prepare batter. Add eggs, milk, almond flour, stevia and vanilla to a blender or Magic Bullet and blend until smooth. Taste for sweetness and adjust if needed. Set aside. Prepare Cheesecake Filling.