Prep the pan: Heat the oven to 350°F (175°C). Line a 8.5 x 4.5-inch loaf pan with parchment and lightly oil the sides.
Mix dry ingredients: In a large bowl, whisk the sunflower seed flour, flaxseed meal, psyllium, baking powder, baking soda, and salt until well combined.
Combine wet ingredients: In another bowl, whisk eggs, oil, almond milk, vinegar, and sweetener until smooth.
Bring it together: Pour wet into dry.
Stir with a spatula until a thick, scoopable batter forms. It should be slightly tacky, not runny. If it’s too thick, add 1–2 tablespoons more almond milk.
Pan and shape: Scrape batter into the prepared loaf pan.
Smooth the top with a damp spatula. Sprinkle seeds on top if using, and lightly press them in.
Bake: Bake for 40–50 minutes, until the top is set and a toothpick comes out clean or with a few moist crumbs.
Cool completely: Let the bread rest in the pan 10 minutes, then transfer to a wire rack. Cool fully before slicing for best texture.
Slice and serve: Use a serrated knife to cut into thin or medium slices.
Toast for extra crunch and aroma.