Prep your pan: Line a 8.5 x 4.5-inch loaf pan with parchment, leaving overhang for easy lifting.
Lightly grease the sides.
Preheat the oven: Set to 350°F (175°C). Place an oven rack in the lower-middle position.
Whisk the wet ingredients: In a large bowl, whisk eggs until smooth and slightly frothy, 30–45 seconds. Whisk in oil (or melted butter), almond milk, and vinegar.
Combine dry ingredients: In a separate bowl, whisk coconut flour, psyllium powder, baking powder, baking soda, salt, and optional sweetener until evenly mixed.
Break up any clumps.
Bring it together: Sprinkle the dry mix over the wet ingredients. Stir with a spatula until fully combined. The batter will thicken quickly as the coconut flour and psyllium absorb liquid.
Rest the batter: Let it sit for 3–5 minutes.
You want it thick but spreadable, not dry. If it’s too stiff, whisk in 1 tablespoon more almond milk.
Fill the pan: Scrape batter into the prepared loaf pan. Smooth the top with a damp spatula, rounding it slightly for a nicer dome.
Bake: Bake 40–48 minutes, until the top is golden and a toothpick comes out clean or with just a few moist crumbs.
The loaf should feel set in the center.
Cool properly: Cool in the pan for 10 minutes. Lift out using the parchment and transfer to a wire rack. Cool completely—at least 1 hour—before slicing.
Slice and serve: Use a sharp serrated knife.
Slice thin for sandwiches, thicker for toast. Toasting improves texture and flavor.