Preheat oven to 350 degrees. Line an 8 x 4 inch loaf pan with parchment paper. Let the parchment paper hang over the sides to use as "handles" when you remove the cake
In a large mixer bowl whisk or sift together coconut flour, baking powder, salt, Swerve, and xanthan gum until no large lumps are in the dry ingredients
Add the eggs and beat on low about 10 seconds or until the dry ingredients are moist. Increase the speed to medium and beat on medium about 30 seconds or until fully combined
Scrape down the sides of the bowl if needed. Add the butter and beat on medium about 30 seconds or until fully combined
Scrape down the sides of the bowl again. Add the keto sweetened condensed milk and the vanilla. Beat on medium once again for another 30 seconds or until fully combined and smooth
Scrape down the sides of the bowl once again and push all the ingredients to the center of the bowl
Scrape the batter into the prepared loaf pan. Use a spatula or wooden spoon and spread the batter evenly throughout the loaf pan
Bake 35-40 minutes or until golden and a tester comes out clean.
Remove from the oven. It will still be slightly soft but will firm up as it cools. If desired sprinkle the top with powdered Swerve or pour a glaze over the top. Allow it to cool in the pan about 1 hour or until close to room temperature
Once cooled grasp the "handles" of the parchment paper and CAREFULLY lift the cake out. Transfer to a wire rack and allow to cool COMPLETELY before slicing