Indulge in these tall and moist plum muffins, packed with cinnamon flavors from both the fruity filling and crunchy crumb topping. The secret to their height? Baking only half of the muffin cups per batch.
Preheat the oven to 400°F (200°C). Grease or line every other muffin cup of a standard 12-cup muffin pan.
For streusel, mix melted butter, brown sugar, flour, cinnamon, and salt in a small bowl until crumbs form. Set aside.
For muffin batter, combine butter, white sugar, salt, cinnamon, and nutmeg in a large bowl. Add in eggs and vanilla; mix until combined. Pour in sour cream and milk; mix until combined. Add in flour, baking powder, and baking soda; mix until almost all the way incorporated with some dry spots of flour remaining. Fold in chopped plums.
Fill every other muffin cup of the prepared pan (only 6 of the 12 cups) to the top with the muffin batter. Crumble streusel over the top of each muffin. Place muffin pan on a baking sheet.
Bake until muffins are tall, golden brown, and the tops spring back when lightly touched, about 25 minutes. Let muffins cool in the pan for 5 to 10 minutes before removing them to a wire rack to cool completely.
Repeat the baking process with the remaining muffin cups and batter.
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