01 -
Set your oven to 375°F and line a 12-cup muffin tin with paper liners.
02 -
Mix sugar, cinnamon, and flour in a small bowl. Add melted butter and fork it together until it’s chunky. Put it in the fridge for a bit.
03 -
In a large bowl, toss together flour, sugar, salt, baking powder, and lemon zest using a whisk.
04 -
In a separate bowl, whisk the egg, melted butter, and buttermilk until it’s combined—even if it looks curdled, it’s fine.
05 -
Blend the wet and dry mixes gently. Stir just enough to combine—it’ll be thick and a bit lumpy.
06 -
Carefully fold in the blueberries, stopping when they’re just spread throughout.
07 -
Scoop batter into the muffin liners evenly—about 3 tablespoons of mix per cup.
08 -
Sprinkle the chilled streusel crumble by hand on top of each muffin.
09 -
Bake for 28 to 30 minutes. The tops should be slightly golden and bounce back if you press them lightly.
10 -
They’re amazing warm but wait a couple of hours for them to fully cool for the best flavor.