Making Rainbow Tie-Dye Cupcakes is a simple process, and following these steps will ensure your success:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a cupcake pan with cupcake liners.

2. Mix Dry Ingredients: In a large bowl, sift together the all-purpose flour, baking powder, and salt.

3. Cream Butter and Sugar: In another bowl, cream the softened butter and granulated sugar together until light and fluffy.

4. Add Eggs and Vanilla: Beat in the eggs one at a time, then add the vanilla extract, mixing until well combined.

5. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, alternating with the milk. Mix until just combined.

6. Divide Batter: Divide the batter evenly into five bowls. Leave one bowl white and add different food coloring to the other bowls (red, blue, yellow, green, purple).

7. Layer the Colors: Using a spoon, drop spoonfuls of each colored batter into the cupcake liners. Alternate colors to create a tie-dye effect.

8. Bake: Place the cupcake pan in the preheated oven and bake for 15-20 minutes or until a toothpick inserted in the center comes out clean.

9. Cool: Once baked, remove the cupcakes from the oven and let them cool in the pan for about 10-15 minutes. Then transfer them to a wire rack to cool completely.

10. Frost and Decorate: Once the cupcakes are completely cool, frost them with your favorite frosting. Add sprinkles on top for an extra fun touch!