Preheat oven to 375 degrees F (190 degrees C). Line a baking sheet with parchment paper.
In a medium-sized bowl, mash the plantain. Mix in the rest of the ingredients for the crust. Pour mixture on prepared baking sheet, and spread to a circular shape.
Bake the plantain crust for 10 minutes, until the crust is firm to touch.
Remove crust from oven and bring heat up to 400 degrees F (205 degrees C).
Spread on pizza sauce. It's up to you how much to use. I used about 3 tablespoons. Sprinkle on mozzarella cheese, parmesan, and diced tomatoes. Dot ricotta cheese all over the pizza.
Bake at 400º F for about another 10 minutes, or until the cheeses have melted. Serve immediately.