Before doing anything, make sure your eggs and butter are at room temperature. It's is essential for good pound cake!
Preheat the oven to 350 degrees Fahrenheit.
Add the butter and sugar to a bowl or bowl of a stand mixer and cream together for 30 seconds or until well incorporated.
With the mixer running, beat in the eggs one at a time, then the extra egg yolk.
Beat in the vanilla.
Turn off the mixer and fold in the dry ingredients. Make sure to spoon and level the flour to measure. Fold in the greek yogurt.
Fold in the sprinkles.
Transfer to a lined loaf pan and spread the top out evenly.
Bake for 60-70 minutes or until a toothpick comes out clean.
Remove from the oven and let cool in the pan for about 15 minutes, then lift out onto a wire rack to finish cooling.
To make the icing, whisk together all ingredients, adding more milk as needed to thin it out, but I prefer it thick for this recipe!
When the cake has cooled completely (2-3 hours) add the icing on top, slice and enjoy!