You won't be able to resist this easy and delicious coffee cake - spring on a plate!
If you forget to soften your butter ahead of time, no worries: cut it into small pieces and let it sit out while you get your other ingredients in place. If your butter is still chilly, you can make the streusel in a stand mixer with the paddle for ease, and warm the butter for the cake by placing the bowl over your oven while it preheats.
For the dairy portion of the cake, I used a combination of yogurt and half and half, which I usually have around. I love the light texture I ended up with, but suspect the cake would work with buttermilk, milk, sour cream or any combination thereof.
Nutritional values are based on one of sixteen squares.