Preheat the oven to 400 degrees F and line a rimmed baking sheet with parchment paper.
Add the flour, baking powder, baking soda, salt, garlic powder, onion powder and pepper to a large bowl. Whisk to break up any lumps of flour. Add the Cheddar and chives. Stir to evenly combine the ingredients. Set aside.
Add the buttermilk and egg to a 2-cup measuring cup. Use a fork to scramble the egg into the buttermilk.
Add the buttermilk mixture to the bowl with the flour mixture and use a rubber spatula to mix the ingredients until a shaggy dough forms. Turn the dough out onto a lightly floured work surface. Lightly flour your hands and knead the dough until it comes together, about 1 minute. Flip the dough so that it is seam-side down and transfer it to the prepared baking sheet. Use a serrated knife to cut a 1/2-inch-thick X on the top of the dough.
Bake until the bread is golden brown, 25 to 30 minutes.
Let cool slightly on a wire rack before slicing.
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