Preheat oven to 350°F. Line 2 round 8-inch pans with parchment paper and spray with non-stick cooking spray (I also spray underneath the paper). Set aside.
In a medium bowl, add the gluten free flour blend, baking powder, xanthan gum and salt. Whisk together. Set aside.
In a large bowl, beat butter and sugar with an electric mixer until creamy. Gradually add the eggs (one at a time) with mixer on low, letting each egg combine with the butter and sugar before adding the next egg. Once all the eggs have been added, mix on medium for 15 seconds.
Measure almond milk and add the vanilla to your measuring cup. With mixer on low, alternate adding the dry ingredients and almond milk mixture. Once you've added all of the dry ingredients and milk, turn mixer up to medium and beat for 15 seconds or until batter is smooth and all of the ingredients are combined.
Pour batter into prepared pans. Bake for 30-35 minutes or until a toothpick inserted into the middle of the cake comes out clean. Let cool.