Rainbow Cupcakes (Gift Mix in a Jar)

JAR Ingredients
2 1/4 cups flour
1/2 teaspoon salt
1 tablespoon baking powder
1 cup miniature M&M chocolate candies
1 2/3 cups sugar

ADDITIONAL INGREDIENTS (to be added by the recipient)
3 large egg whites
1 cup milk
1/2 cup butter, softened
2 teaspoons vanilla extract

Creating the Gift in a Jar:
Wash and thoroughly dry a 1-quart wide-mouth canning jar.
Layer the ingredients in the jar as listed above starting with the flour, salt, baking powder, M&Ms and then sugar - make sure to press firmly with a flat bottomed object after each addition; make the layers as level as possible.
Secure the lid and decorate as desired; attach the instructions for making these cookies found below.
RAINBOW CUPCAKES GIFT TAG:
Additional ingredients to be added by the recipient: 3 large egg whites, 1 cup milk, 1/2 cup butter, softened, and 2 tsp vanilla extract.
RAINBOW CUPCAKES INSTRUCTIONS:
Preheat oven to 350.
In a large bowl, combine the egg whites, milk, butter and extract; blend with electric mixer set on medium speed for 2 minutes.
Add the contents of the jar and blend on low speed for 2 minutes.
Spoon the batter into papered muffin tins, filling each liner two-thirds full.
Bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
Cool for 5 minutes in the tin, then transfer to a wire rack and cool completely.