Preheat oven to 400 °F (204 °C). Put the dough blade in the food processor.
Add the flour, baking powder, sugar and salt to the bowl of a food processor. Process to combine. Put the bowl in the refrigerator.
Cut the butter into 1/2 inch pieces and put it in the freezer while the oven comes to temperature.
When the oven has reached 400 °F (204 °C), remove the bowl from the refrigerator and put it on the processor's base. Add the butter to food processor and pulse 2 to 3 times to form pea-sized pieces.
Put the milk and blueberries in the food processor and mix just until it starts to form a ball.
Remove the dough from the bowl to a flour covered counter. Form the dough into a ball, then start flattening it with your hand until its about 1/2 inch thick.
Use a dough slicer to cut the dough into 8 relatively even slices. Put the slices in the silicone scone pan.
Bake the scones until golden brown, about 20 minutes.
Use a pizza peel to get the scones out of the oven.
Let cool slightly, then flip the pan over and the scones will fall right out.
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