Cooking spray
12 ounces cream cheese, at room temperature
1/4 cup butter, melted
1/4 cup oil
1/4 cup heavy whipping cream
2 drops liquid Stevia
4 large eggs
1 tablespoon gluten-free baking powder
1 teaspoon xanthan gum
1-2/3 cups whey protein powder
1/2 teaspoon salt
1/4 teaspoon cream of tartar
Preheat the oven to 325 degrees F. Spray a 9-by-5-inch loaf pan with cooking spray.
In a large mixing bowl with an electric mixer, beat together the cream cheese, butter, oil, cream and Stevia. Add the eggs, one at a time, beating after each addition to incorporate.
Add the baking powder and xanthan gum and beat to incorporate thoroughly.
Add the protein powder, baking soda, salt and cream of tartar and stir by hand to incorporate.
Transfer the batter to the prepared pan and bake in the preheated oven until the top is golden brown, about 45 minutes.
Turn out the loaf onto a cooling rack and let it cool before slicing.