Preheat oven to 325 F and prepare a 9" bread pan with cooking spray.
Soften cream cheese (12 ounces) and unsalted melted butter (1/4 cup) (this can be done in the microwave using 30 second intervals).
Add cream cheese, butter, olive oil (1/4 cup), heavy cream (1/4 cup) and eggs (4) to a large bowl and blend using a stick blender until everything is well combined.
In a second bowl mix the whey protein powder (1 2/3 cup), baking soda (1/3 teaspoon), baking powder (2 1/2 teaspoon ), xanthan gum (1 teaspoon) and salt (1/2 teaspoon).
Add wet ingredients to the dry ingredients and stir by hand just enough for the ingredients to combine (don't over stir!).
Pour batter into greased bread pan and bake for 45 minutes. You'll know the bread is done when a knife inserted in the center comes out clean and the top is golden brown.