01 -
Use a fork to mash the flour, sugar, and butter together in a bowl. Once it forms a crumbly texture, leave it aside for later use.
02 -
Heat your oven to 350°F (176°C). Either line your muffin tin with paper liners or grease it generously so nothing sticks.
03 -
Stir the flour, sugar, baking powder, corn starch, lemon zest, salt, and baking soda well in a big bowl. Toss in the blueberries so they get lightly coated in the dry mix. This keeps them from sinking while baking!
04 -
In a medium-sized bowl, whisk the wet ingredients until smooth. Pour this into the mixture of dry ingredients and stir until combined. If it feels thick, add a little water or milk (about 1-2 tablespoons) until it loosens up.
05 -
Spoon the batter evenly into your 12 muffin cups. Generously scatter the crumb topping over each one, and lightly press so it stays in place.
06 -
Bake for 30-35 minutes. They're ready when a toothpick poked in the middle comes out clean. Let them cool for about 10 minutes in the tin before transferring to a cooling rack.