01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with parchment paper.
02 - In a large bowl, whisk together the gluten-free flour, sugar, baking powder, baking soda, salt, cardamom, and orange zest until evenly distributed.
03 - In a separate bowl, beat the eggs. Whisk in the orange juice, oil, and vanilla extract until well combined.
04 - Pour the wet mixture into the dry ingredients and fold gently with a spatula until just combined. Avoid overmixing to maintain a tender crumb.
05 - Pour the batter into the prepared loaf pan. Smooth the top with a spatula and sprinkle with sliced almonds and coarse sugar if desired.
06 - Bake for 45 to 55 minutes, or until a toothpick inserted into the center comes out clean.
07 - Allow the bread to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.