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In a small saucepan, simmer milk, raisins, and rosemary for 2 minutes; remove from heat; add in butter and stir until melted; let cool.
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Preheat oven to 350°; grease mini muffin tins or use foil baking liners.
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In a big bowl, mix flour, sugar, baking powder, and salt.
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Whisk egg into the milk mixture; pour liquid mixture over dry ingredients and fold in with a rubber spatula just until dry ingredients are moistened.
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Scoop batter into muffin cups; bake about 20 minutes, or until browned and springy in the center.
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Turn out of pan and serve hot, or cool on a rack.