Creating these Cinnamon Breakfast Muffins is simple and straightforward. Just follow these easy steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, baking powder, ground cinnamon, and salt.
3. Combine Wet Ingredients: In another bowl, beat the egg and then add the milk, melted butter, and vanilla extract. Mix until well combined.
4. Combine Mixtures: Pour the wet ingredients into the dry ingredients, stirring gently until just combined. Be careful not to overmix; a few lumps are okay.
5. Prepare Topping: In a small bowl, mix together the brown sugar and the remaining tablespoon of ground cinnamon for the topping.
6. Fill Muffin Tin: Divide the muffin batter evenly among the muffin cups, filling each about two-thirds full.
7. Add Topping: Sprinkle a generous amount of the cinnamon-brown sugar mixture on top of each muffin.
8. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.
9. Cool: Once baked, remove the muffins from the oven and let them cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely.

These steps will guide you in creating delicious Cinnamon Breakfast Muffins that are sure to impress!