Follow these straightforward steps to create your own delightful Cinnamon Roll Muffins:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or grease it with non-stick spray.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, baking powder, salt, and ground cinnamon.
3. Combine Wet Ingredients: In another bowl, mix the milk, vegetable oil, eggs, and vanilla extract until well combined.
4. Combine Mixtures: Pour the wet ingredients into the dry ingredients. Stir until just combined; do not overmix.
5. Prepare the Filling: In a small bowl, combine the brown sugar and the additional tablespoon of cinnamon.
6. Fill the Muffin Tin: Spoon a small amount of batter into each muffin cup (about one-third full). Sprinkle a teaspoon of the cinnamon-sugar mixture over the batter.
7. Add More Batter: Top with more batter until the muffin cups are two-thirds full. Sprinkle additional cinnamon-sugar on top.
8. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes or until the muffins are golden brown and a toothpick inserted in the center comes out clean.
9. Cool: Remove the muffins from the oven and allow them to cool in the pan for 5-10 minutes before transferring them to a wire rack.
10. Prepare the Glaze: While the muffins cool, mix powdered sugar with 1-2 tablespoons of milk in a small bowl until smooth.
11. Glaze the Muffins: Drizzle the glaze over the cooled muffins for a sweet finish.

By following these simple instructions, you can enjoy warm, fluffy Cinnamon Roll Muffins that are sure to delight your taste buds.