I was looking for a non-fruit based protein shake because I'm trying to cut down on fructose and I made this sweet potato smoothie and I love it. It tastes like liquid sweet potato pie.

Blend-
1 cooked peeled sweet potato 54 calories, 1.2 g protein, 12.4g carbs
1 scoop casein, 124 calories, 24 g protein, 3 g carbs
2 egg whites. 37 calories, 7.2 g protein, .4 g carbs
1/4 cup non fat yogurt 34 calories, 3.5 g protein, 4.75 g carbs
1/2 cup almond milk or reg milk or water, 30 calories, .5 g protein, 2 g carbs
1 teaspoon vanilla extract 12 calories, >.01 g protein, .5 g carbs
1 teaspoon pumpkin pie spice

I also substituted the vanilla for a little coffee and was totally pleased with the taste. Of course you could substitute whey for the casein if you'd like. I'm also gonna try some butterscotch extract one of these days.
calories- 291
protein- 36.4
carbs- 23