Preheat oven to 350 degrees. Line the bottom of a 8 1/2 x 4 1/2 inch loaf pan the lightly spray the sides of the pan
In a medium mixing bowl whisk together almond flour, psyllium husk powder, salt, whey protein powder, xanthan gum, baking powder, baking soda, and cream of tartar until fully combined and no lumps in the flour
In a large mixer bowl combine warm milk, eggs, oil, and apple cider vinegar. Beat on low for 10 seconds or until combined then on medium 3 minutes or until frothy
Add half of the dry ingredient and whisk on medium 10 seconds or until combined. Add remaining dry ingredients and beat on medium 20 seconds or until fully combined smooth
Scrape down the sides of the bowl and push all the dough into the center of the bowl. Scrape dough into the prepared loaf pan and use a damp spatula to evenly spread the dough across the pan. The dough will be thick and wet
Bake at 350 degrees for 35-40 minutes or until a tester comes out clean. Let cool in the pan for 10 minutes to allow the ingredients to lock together.
Use a butter knife and loosen the edges. Turn bread onto wire rack. Let cool completely before slicing