Preheat & Prep
Preheat oven to 325°F (important for Bundt cakes).
Lightly grease and flour your silicone Bundt pan or spray with Baker’s Joy (nonstick spray with flour).
In a large bowl, whisk together cake mix and pudding mix.
Add eggs, sour cream, milk, oil, and vanilla.
Beat with a hand or stand mixer for about 2 minutes until smooth and thick.
Fold in sprinkles gently at the end so they don’t bleed.
Pour into the prepared pan and tap it gently to remove air bubbles.
Bake for 45–55 minutes, or until a toothpick comes out clean and the top bounces back lightly to the touch.
(Silicone pans sometimes bake a little slower — check around 50 minutes.) (My Silicone pan from Aldi I had to increase temp to 340 and cook for an additional 20 minutes)
Let it cool in the pan for 15–20 minutes, then carefully flip onto a cooling rack.
Allow to cool completely before frosting.