Add the cake batter to the prepared bundt pan, making sure it's spread in an even layer.
Bake for 55-60 minutes, or until a toothpick inserted comes out clean.
Remove from the oven and let cool in the pan for 10-15 minutes, then place a plate or cooling rack on the bottom of the pan and then gently invert to get the cake out of the pan. Let the cake finish cooling .
Once the cake is cool, melt chocolate chips and milk together to make the ganache. Gently drizzle it on top of the cake. If you're adding sprinkles, do so now.
2/3 cup milk, 1 cup semisweet chocolate chips, 1 tablespoon sprinkles