Preheat the oven to 375 degrees F. Line an 8-inch cake pan with parchment paper and lightly spray or brush with oil. Set aside.
Add gluten-free flour, almond flour, potato starch, baking powder, salt, and mix well in a large bowl.
Using a handheld mixer, add almond milk, avocado oil, vanilla, and mix until the batter is smooth.
Divide the batter into two layers and bake for 35 minutes or until a skewer inserted in the middle comes out clean.
Meanwhile, prepare the frosting while the cake is baking.
Allow cake to sit in the baking pan for 5 minutes, remove from the pan and rest on a cooling rack until it is completely cooled.