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Butter swim biscuits studded with juicy blueberries bake up with a soft, fluffy interior and irresistibly crunchy top.
Gather all ingredients.
Place butter in an 8-inch square baking dish and place dish in oven. Preheat oven to 425°F, leaving dish in oven as it heats.
Whisk together flour, granulated sugar, baking powder, lemon zest, salt, and baking soda in a medium bowl. Stir in buttermilk. Remove dish from oven. Using an oven mitt or towel, carefully tilt dish to one side and use a tablespoon measure to scoop out 4 tablespoons melted butter into dough, leaving remaining melted butter in dish. Stir dough until combined. Fold in blueberries.
Spread dough evenly into dish. Sprinkle dough evenly with turbinado sugar. Bake at 425°F until browned and cooked through, about 25 minutes. Remove dish from oven and let stand until butter absorbs into biscuits, about 5 minutes. Cut into 9 equal pieces.