Preheat your oven to 350°F (175°C). Grease a 9x5-inch loaf pan.
In a large mixing bowl, combine the flour, baking powder, salt, and garlic powder. Stir until well mixed.
Add the shredded cheddar cheese and chopped jalapenos to the dry ingredients, mixing until the cheese is evenly distributed.
In a separate bowl, whisk together the milk, melted butter, and egg until well combined.
Pour the wet ingredients into the dry ingredients and stir until just combined. Do not overmix; a few lumps are okay.
Transfer the batter to the prepared loaf pan, smoothing the top with a spatula.
Bake for 45-50 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.