Preheat your oven to 350°F (175°C). Line the muffin tin with paper liners or grease it with cooking spray.
In a large mixing bowl, combine the flour, sugar, baking powder, salt, and cinnamon. Mix well.
In another bowl, whisk together the milk, vegetable oil, eggs, and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients. Stir gently until just combined; do not overmix.
Fold in the chocolate chips or dried fruits with a rubber spatula until evenly distributed.
Evenly distribute the batter into the muffin tin, filling each cup about two-thirds full.
Bake in the preheated oven for about 20 minutes, or until a toothpick inserted in the center comes out clean.
Remove from the oven and let the muffins cool in the tin for 5 minutes, then transfer them to a cooling rack to cool completely.
Optional: Once cooled, top the muffins with colorful sprinkles for an Easter touch.