1. Add butter to a mixing bowl, stir in both granulated and brown sugar and mix until combined
2. Add eggs and vanilla, continue to mix
3. In a separate bowl, combine the dry ingredients
4. Gradually add to the butter mixture
5. Press dough into a lined 9×13 pan and bake at 350 for 45 minutes
6. Allow to cool completely
7. Either cut into squares or use cookie cutter to press out egg-shaped bars

To make the frosting:

1. Add the butter to a bowl and whip
2. Add sugar and gradually stir in milk or cream until whipped into a light and fluffy texture
3. Add to a piping bag and pipe frosting on individual bars
4. Top with easter sprinkles