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1
Adjust oven rack to lower middle position and heat oven to 375 degrees.
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2
Mix flour through nutmeg in medium bowl; set aside.
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3
Beat butter in large bowl of electric mixer or with handheld mixer at medium speed until light and fluffy, 1 to 2 minutes.
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4
Add brown sugar, increase speed to medium-high, and beat until combined and fluffy, about 1 minute longer.
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5
Add eggs one at a time, beating thoroughly before adding the next.
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6
Beat in vanilla, molasses, and sour cream until thoroughly combined and creamy, about 1 minute longer.
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7
Reduce speed to low; beat in buttermilk and half the flour mixture until combined, about 1 minute.
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8
Beat in remaining flour mixture until incorporated and slightly curdled looking, about 1 minute longer, scraping sides of bowl as necessary.
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9
Stir in bran and raisins.
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10
Spray a twelve mold muffin tin (each mold measuring 1/2 cup) or a six mold muffin tin (each mold measuring one cup) with cooking spray or coat lightly with butter; divide batter evenly among molds using spoon or ice cream scoop.
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11
Bake until a toothpick inserted into center withdraws cleanly or with a few moist particles adhering to it, about 25 minutes.
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12
Set on wire rack to cool slightly, about 5 minutes.
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13
Remove muffins from tin and serve warm.