Preheat your oven to 350°F (175°C). Place a Dutch oven inside while the oven is heating.
In a large bowl, whisk together almond flour, baking powder, salt, garlic powder, onion powder, and cayenne pepper (if using) until well combined.
In a separate bowl, beat the eggs, then mix in the sour cream and melted butter until smooth.
Add the wet ingredients to the dry ingredients and stir until just combined.
Fold in the shredded cheddar cheese and diced jalapeños, ensuring they are evenly distributed throughout the batter.
Carefully remove the hot Dutch oven from the oven using oven mitts. Line it with parchment paper for easy removal of the bread.
Pour the batter into the Dutch oven and smooth out the top with a spatula.
Cover with the lid and bake for 45 minutes, or until a toothpick inserted into the center comes out clean.
Optional: In the last 10 minutes of baking, remove the lid and brush the top with additional melted butter for a golden crust.
Once done, remove the Dutch oven from the oven and let the bread cool for 10 minutes before lifting it out onto a wire rack.
Slice and serve warm or at room temperature.