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Export 9 ingredients for grocery delivery
Step 1
Heat oven to 375°.
Step 2
Grease 18 regular-size muffin cups (or 12 large size muffins).
Step 3
In bowl, mix butter until creamy. Add sugar and beat until pale and fluffy.
Step 4
Add eggs one at a time, beating after each.
Step 5
Beat in vanilla, baking powder, lemon zest, and salt.
Step 6
With spoon, fold in half of flour then half of milk into batter; repeat.
Step 7
Fold in blueberries.
Step 8
Spoon into muffin cups and sprinkle topping onto each muffin.
Step 9
Bake 15 to 20 minutes, until golden brown and springy to touch.