-
1
Preheat the oven to 375. Have ready one 12-cup muffin pan. Grease 10 of the cups and fill any unused cups with water to prevent warping. (I usually grease 11 of the cups and grease the top of the pan as well since they have big muffin tops).
-
2
To make the topping, in a small bowl, stir together the flour, sugars, cinnamon, and mace (or nutmeg). Cut the butter into pieces and, using a pastry blender or 2 knives, cut it into the dry ingredients until the mixture resembles coarse crumbs.
-
3
To make the muffins, stir together the flour, sugars, bakng powder, baking soda, salt and orange zest in a bowl.
-
4
In another bowl, whisk toghether the eggs, melted butter, vanilla, and buttermilk. Stir the butter milk mixture into the dry ingredients just until combined. The batter should be lumpy. Fold the blueberries into the batter just until evenly distributed. Scrape down the sides of the bowl.
-
5
Spoon the batter into each muffin cup, filling it level with the rim of the cup. Sprinkle each muffin with some crumb topping.
-
6
Bake until golden, dry, and springy to the touch, 20 -25 minutes. A cake tester inserted into the center of a muffin should come out clean. Let stand for 5 minutes, then remove each muffin from its cup with a small metal spatula. Serve warm.
