Preheat oven to 450˚F (230˚C). Line a baking sheet with parchment paper.
Mix Dry Ingredients: In a food processor or bowl, combine 2 cups unbleached all-purpose flour, 1/3 cup granulated sugar, 1/4 teaspoon baking soda, and 1/4 teaspoon cinnamon. Pulse or whisk to mix.
Cut in Butter: Slice 1/2 cup cold unsalted butter and cut it into the dry mixture until it resembles oatmeal.
Add Wet Ingredients: Beat 1/4 cup 2% or whole milk and 1 large egg together. Stir into the flour mixture until just combined.
Fold in Blackberries: Gently mix in 1 cup fresh blackberries, being careful not to crush them.
Shape and Cut: Transfer dough to a floured surface. Pat into a 1-inch thick rectangle and cut into 12 triangles.
Freeze or Bake: Arrange scones on a baking sheet. Freeze for later or bake immediately.
Bake: 13-15 minutes until golden brown. If baking frozen, add a couple of extra minutes.
Make the Glaze: Microwave 1 tablespoon butter and 2 blackberries until butter melts. Mash the berries, then stir in 1 tablespoon heavy cream or half-and-half, 1 cup powdered sugar, and 1 teaspoon vanilla extract until smooth.
Drizzle and Serve: Spoon glaze over slightly cooled scones. Enjoy!
Notes
Can I make these ahead of time? Yes! Freeze the dough and bake fresh when needed