Step 1

Preheat your oven to 325°F. Grease well a standard loaf pan (about 9-inches x 5-inches, or a bit smaller) and set it aside.

Step 2

In the bowl of a stand mixer fitted with the paddle attachment or a large bowl with a handheld mixer, cream the butter on medium-high speed until it is light and fluffy.

Step 3

Add the sugar, and then the eggs (slowly, while the mixer is on low speed) and vanilla, beating after each addition until well-combined. Turn the mixer speed up to medium-high, and beat until smooth.

Step 4

In a small bowl, place the flour blend, xanthan gum and salt, and whisk to combine well. Add the flour mixture, about ¼ cup at a time, to the mixer bowl with the wet ingredients, and mix until just combined.

Step 5

The batter will be thick but soft and smooth. Scrape the mixture into the prepared loaf pan, and smooth the top with a wet spatula. Carefully bang the bottom of the pan a few times on the counter to release any air bubbles.

Step 6

Place the loaf pan in the center of the preheated oven and bake, rotating once during baking, until lightly golden brown all over and a toothpick inserted in the center comes out clean (about 50 minutes).

Step 7

Remove from the oven and place the cake, still in the pan, on a wire rack to cool for at least 30 minutes before removing from the pan and allowing to cool completely.