Add flour, baking soda, baking powder, and salt.
Scoop into 1 1/2-tablespoon portions.
For best results, use fresh lemon zest and juice — it enhances the citrus flavor.
If using frozen blueberries, do not thaw. Toss them in a little flour to prevent streaking.
Chill the dough for 20 minutes if it's too soft to handle.