Preheat oven to 350 degrees and grease bundt pans. I used a mid-sized mini bundt pan but you can use a true mini bundt pan!
Combine all ingredients for chocolate bundt cake and stir until smooth. Fill bundt pans 2/3 full and bake. If you're using a mid-sized mini bundt pan like mine, bake for 17-20 minutes, if you're using a true mini bundt pan bake for 8-10 minutes or until and inserted knife comes out clean.
Icing: Whisk all ingredients together. Add more powdered sugar if you want the icing thicker! Drizzle over cooled cakes and immediately sprinkle with crushed Oreos to make the cakes look like a bunny hole in the ground! Stick in Bunny PEEPS and enjoy!