I made all sorts of treats to go with the theme, Chocolate Chip M&M Cookies, M&M Rice Krispie Treats, M&M Pretzel Sticks, and more.
Here's the birthday boy all smiles when he saw his cake. He was excited by all the mini M&M's pouring down the front. All the kids wanted a slice with the M&M's on it.
For the favor bags, I bought individual packs of Birthday Cake M&M's and added some bubbles and other candies. The clear bags are from Walmart and the tags I made myself. I put all the kids names on the back. I attached the tags with matching bakers twine I had on hand.