Preheat the oven to 350 degrees Fahrenheit.
Toss the pistachios, pepitas, date crystals, corn starch and 2 tablespoons coconut oil together in a small bowl with a big pinch of salt. Set aside.
In a large bowl, stir together dates, oats, baking powder, spices and a pinch of salt.
Whisk oat milk, egg and remaining coconut oil together in a cup, then stir into oat mixture until evenly distributed.
Spray a brownie pan with cooking spray.
Pour oat mixture into the pan. Sprinkle with nut topping. Arrange sliced persimmons on top.
Bake for 25-30 minutes.
Top it off with a little yogurt and enjoy!