Step 1

Preheat an oven to 180c (350f) and prep a 12-cup muffin pan with paper liners.

Step 2

Into a big mixing bowl, add the sugar, brown sugar, eggs, vanilla extract, greek yogurt, buttermilk, kosher salt, and cooled melted butter. Mix with a whisk until the mixture is well combined.

Step 3

Into a medium mixing bowl, add the flour, cinnamon, baking powder, and baking soda, and mix until just combined.

Step 4

Add the dry ingredients to the wet ingredients and mix with a whisk until just combined. Don’t overmix the batter!

Step 5

Make the cinnamon sugar: mix cinnamon and sugar in a small mixing bowl until well combined.

Step 6

Into a medium mixing bowl, add the flour, sugar, cinnamon, and melted butter. Mix with a spoon until the mixture is well combined.

Step 7

Scoop the batter halfway through with an ice cream scooper, and top with about 1 tsp of the cinnamon sugar. Scoop the second half of the mixture onto the cinnamon sugar topping.

Step 8

Top the muffins with about 1 tbsp of the streusel topping and press the streusel topping onto the muffin batter so it sticks and does not fall off while baking.

Step 9

Bake in a 180c (350f) preheated oven for 18-20 minutes or until a toothpick comes out clean. Don’t overbake these muffins! Let the muffins cool for at least 15 minutes before serving.

Step 10

Into a small mixing bowl, add the powder sugar, milk, and vanilla. Mix with a spoon until the mixture is well combined and until the glaze is smooth and silky.

Step 11

Top each muffin with as much glaze that you would like, and serve warm next to a cup of coffee or hot tea. Enjoy!