Preheat oven to a moderate baking temperature

Line a small loaf pan with parchment paper

Add almond flour, sweetener, baking powder, and salt to a bowl

Whisk dry ingredients until evenly combined

In a separate bowl, whisk eggs thoroughly

Add melted butter, lemon juice, zest, and vanilla

Stir until smooth and cohesive

Combine wet and dry mixtures

Stir gently until batter forms

Transfer batter into prepared pan

Smooth the top evenly

Bake until bread is set and lightly golden

Remove from oven and cool completely

Slice and serve