6tablespoonsunsalted buttermelted and cooled slightly
1teaspoonvanilla extract
2 ¼cups11 ¼ ounces all-purpose flour
1 ½teaspoonsbaking powder
¼teaspoonbaking soda
¼teaspoontable salt
¼cup3 ½ ounces sugar, divided
¼teaspoonground cinnamon
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Instructions
Prepare the Filling:
In a 5 to 6-quart Dutch oven, combine 4 cups of blueberries, sugar, cinnamon, water, and lemon zest.
Cook over medium-high heat, stirring occasionally, until the mixture thickens and becomes jam-like (about 10–12 minutes).
In a small bowl, whisk together the lemon juice and cornstarch, then stir into the blueberry mixture.
Add the remaining 4 cups of blueberries and cook for 1 more minute, then remove from heat, cover, and keep warm.
Make the Biscuit Dough:
In a 2-cup liquid measuring cup, combine buttermilk, melted butter, and vanilla.
In a large bowl, whisk together flour, baking powder, baking soda, salt, and 6 tablespoons of sugar.
Slowly stir the buttermilk mixture into the dry ingredients until a dough forms.
Cook the Biscuits on the Blueberry Mixture:
Using a small ice cream scoop or two large spoons, drop golf ball-sized pieces of dough over the warm berry mixture (you should get about 14 biscuits).
Wrap the lid of the Dutch oven with a clean dish towel to absorb condensation, then cover the pot.
Simmer gently until the biscuits have doubled in size and a toothpick inserted in the center comes out clean (about 16–22 minutes).
Final Touch & Serve:
Mix the remaining 2 tablespoons of sugar with cinnamon.
Remove the lid and sprinkle the biscuit topping with cinnamon sugar.