1-Preheat and Prepare: Preheat your oven to 450°F (232°C). Spray a 9×9-inch glass or ceramic baking dish with nonstick cooking spray. Using glass or ceramic dishes ensures even heat distribution and prevents overcooked edges that can happen with metal pans.

2-Melt the Butter: Melt your butter either in the microwave or directly in the baking dish if it’s safe for stovetop use. Once melted, pour the butter into the prepared baking dish, spreading it evenly across the bottom.

3-Combine Dry Ingredients: In a medium bowl, whisk together the flour, sugar, baking powder, and salt until well combined. This step helps to evenly distribute the leavening agents, ensuring your biscuits rise uniformly.

4-Add Buttermilk: Pour in the buttermilk and stir until a sticky dough forms. If the dough seems too dry, add more buttermilk up to 2 cups total. The dough should be moist but not overly wet.

5-Incorporate Blueberries: Gently fold in the blueberries, being careful not to crush them. If using frozen berries, make sure they’ve been thoroughly thawed and patted dry to prevent a soggy dough.

6-Assemble in Dish: Pour the dough over the melted butter in the baking dish. Use a hand sprayed with nonstick spray to spread it evenly. This prevents the dough from sticking to your hand and makes spreading much easier.

7-Pre-cut for Easy Serving: Cut the dough into 9 squares to facilitate easier cutting after baking. This pre-cutting ensures clean lines and makes serving a breeze once the biscuits are done.

8-Bake: Place on the middle rack of your preheated oven and bake for 25-30 minutes, rotating the dish once halfway through. Baking times can vary depending on your oven, so start checking for doneness at the 25-minute mark.

9-Check for Doneness: The biscuits are done when the tops are golden brown and a toothpick inserted into the center comes out clean. This visual and texture test ensures they’re perfectly baked through.

10-Prepare the Glaze: While the biscuits are baking, whisk together the powdered sugar and milk until smooth. Add milk gradually until you reach your desired consistency thicker for a drizzle, thinner for a more liquid glaze.

11-Glaze and Serve: Once the biscuits are out of the oven, immediately drizzle the glaze over the warm surface. Let the biscuits cool slightly before slicing along the pre-cut lines and serving. The slight cooling allows the glaze to set while the biscuits remain warm and delicious.