01 -
Preheat the oven to 375°F and pop liners into the muffin tray.
02 -
Stir white sugar, cinnamon, and flour together in a small bowl. Mix in the butter with a fork until the mixture gets crumbly, then stick it in the fridge to chill.
03 -
Combine baking powder, salt, sugar, flour, and lemon zest in a large mixing bowl using a whisk.
04 -
Stir together the egg, buttermilk, and melted butter in another big bowl. It might separate a little, but that’s fine.
05 -
Slowly stir the wet combo into your dry mix. Don’t overmix—leave it lumpy!
06 -
Gently fold the blueberries into the dough. Mix softly to keep the batter from turning purple.
07 -
Use a cookie scoop (3 tablespoons) to evenly fill all 12 cups.
08 -
Sprinkle the topping from the fridge over each muffin.
09 -
Slide the tray into the oven for 28–30 minutes. The muffins should turn slightly golden on top and spring back if pressed gently.
10 -
Enjoy them warm or wait a couple of hours—they taste even better cooled!