Let’s get baking! Here’s a detailed, step-by-step guide:

Step 1: Preheat and Prepare

Preheat your oven to 350°F (175°C). Line two 12-cup muffin tins with cupcake liners.

Step 2: Make the Cupcake Batter

Prepare the Funfetti cake mix according to the package directions. Add the ground cinnamon to the batter and mix until just combined.

Step 3: Bake the Cupcakes

Fill the cupcake liners about 2/3 full with batter.

Bake for 24 to 26 minutes, or until a toothpick inserted into the center comes out with moist crumbs (not wet batter).

Step 4: Cool the Cupcakes

Remove the cupcakes from the oven and let them cool in the muffin tins for a few minutes before transferring them to a wire rack to cool completely.

Step 5: Make the Frosting

While the cupcakes are cooling, make the frosting. In a large bowl, using a hand mixer, whip the softened butter until light and fluffy.

Gradually add the powdered sugar, beating until combined.

Add the melted white chocolate, milk, vanilla extract, and salt. Beat until the frosting is smooth and creamy.

Gently fold in 1 cup of sprinkles.

Step 6: Frost and Decorate

Once the cupcakes are completely cool, frost each cupcake with a generous amount of frosting, leaving a small dome at the top.

Top with more sprinkles and Birthday Cake Teddy Grahams.

Serve and enjoy this nostalgic treat!