Cinnamon Sugar Delight Muffins

Preheat the oven to 375 degrees F and generously spray a standard muffin pan with non-stick cooking spray.

In a large mixing bowl, cream together the softened unsalted butter and granulated sugar for about 2 minutes until smooth and well combined.

Add the egg, vanilla extract, milk, and Greek yogurt to the bowl, mixing until combined.

Fold in the all-purpose flour, baking powder, baking soda, ground cinnamon, and salt using a rubber spatula, just until combined. Avoid overmixing.

Spoon the batter into the prepared muffin tins, filling each about 2/3 full.

Bake in the preheated oven for about 15-20 minutes, or until a toothpick inserted in the center comes out clean, or with just a few moist crumbs. Allow the muffins to cool in the tin for a minute or two before transferring them to a wire cooling rack.

While the muffins bake, prepare the topping by melting the unsalted butter and mixing the granulated sugar and ground cinnamon in a separate small container.

Once the muffins have cooled for a few minutes, use a pastry brush to gently apply a thin layer of melted butter on top of each muffin. Generously sprinkle the cinnamon sugar mixture over the buttered muffin tops to create the cinnamon sugar topping.