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Preheat Oven: Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or a silicone baking mat.
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Mix Dry Ingredients: In a large mixing bowl, whisk together the flour, baking powder, salt, and garlic powder (if using).
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Cut in Butter: Add the cold, cubed butter to the flour mixture. Use a pastry cutter or your fingers to blend the butter into the flour until it resembles coarse crumbs.
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Add Cheese and Jalapeños: Stir in the shredded cheddar cheese and diced jalapeños until evenly distributed.
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Mix the Dough: Gradually add the milk, stirring until the dough just comes together. Do not overmix; the dough should be slightly sticky.
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Shape the Biscuits: Scoop the dough onto the prepared baking sheet in 1/4-cup portions or shape into rounds by hand. Space them about 2 inches apart.
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Bake: Bake in the preheated oven for 15-20 minutes, or until the biscuits are golden brown on top.
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Optional Topping: For extra flavor, brush the tops with melted butter after baking and sprinkle with a pinch of garlic powder or additional cheese.