The butter and granulated sugar should be added to a large mixing bowl, and the mixture should be creamed together for about two minutes, until it is smooth and thoroughly blended. After that, include the egg, vanilla, milk, and sour cream into the mixture and stir until it is uniform.
A mixture of flour, baking powder, baking soda, cinnamon, and salt should be added to the butter mixture. Make use of a rubber spatula to mix in the ingredients until they are almost completely combined. In order to avoid overmixing,
To fill each muffin tray to about ⅔ of its capacity, transfer the mixture using a spoon into the muffin pan that has been buttered. Insert a toothpick into the middle of each pan that has been filled with batter.
Transfer the muffin tray to the oven that has been warmed and bake for about twenty-five minutes, or until a toothpick that has been inserted comes out clean.
After the muffins have been baked, they should be allowed to cool for one to two minutes in the muffin tray before being transferred to a wire cooling rack.
Regarding the topping:
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