Preheat your oven to 375°F (190°C). Line your muffin tin with paper liners or grease it well — you’re about to bake happiness!
In your mixing bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, salt, and cinnamon. Smell that cinnamon? Pure joy.
In another bowl, whisk the milk, oil (or melted butter), egg, and vanilla extract until smooth and friendly.
Pour the wet ingredients into the dry ingredients. Gently stir until just combined — no overmixing, we want fluffy muffins, not tough ones!
Scoop the batter evenly into your muffin cups, filling each about two-thirds full.
In a small bowl, mix the cinnamon and sugar for your topping. Sprinkle generously over each muffin — go wild!
Bake for 16–18 minutes, or until a toothpick poked in the center comes out clean.
Let the muffins rest in the tin for about 5 minutes, then transfer them to a wire rack (if you can wait!).
Serve warm with a pat of butter, a drizzle of honey, or just as they are — perfect every time!