Chocolate Cake with Cashew Frosting

I wanted to bake something today and decided on chocolate cake. I started with this recipe from NoraCooks, but changed it enough to note ...

Dry Ingredients

1 cup white whole wheat flour

1/4 cup regular sugar

1/4 cup stevia sugar

1/4 cup cocoa powder

1 teaspoon baking powder

1/4 teaspoon baking soda

1/2 teaspoon salt

1/3 cup non-dairy chocolate chips

Wet Ingredients

3/4 cup cooked and peeled sweet potato

1/2 cup unsweetened cashew milk

1/2 tablespoon apple cider vinegar

2 teaspoons pure vanilla extract

1/2 cup soft tofu (silken would've been preferable)

And for the cashew frosting, I didn't have any maple syrup or even agave so I used my stevia powder.