01 -
Heat the oven to 350°F (175°C) and line a baking tray with parchment paper.
02 -
In a bowl, mix together salt, baking soda, baking powder, and flour. Leave it aside.
03 -
Use a mixer to beat the softened butter and sugar together for about 3-4 minutes until fluffy and pale-looking.
04 -
Pour in the egg and vanilla extract, and blend everything until it’s smooth and consistent.
05 -
Gradually fold the dry mix into the wet one. Stir lightly until it all comes together, but stop before overmixing.
06 -
Toss the blueberries and lemon zest into the dough, stirring carefully. Add purple food coloring if you want, and mix until the color’s uniform.
07 -
Roll the dough into balls roughly 1 inch wide. Set them on the baking sheet, press down gently, and sprinkle some coarse sugar on top.
08 -
Pop them into the oven and bake for 12-15 minutes. The edges should get a bit golden, while the centers might still seem a tad soft. Let them cool on the tray for 5 minutes before moving them to a cooling rack.