Persimmon puree: Add the chopped persimmon to a blender and blend to a smooth puree. ( I have not added any water).
3 Persimmons
Crumb topping: Add butter, brown sugar, granulated sugar, flour, and cinnamon powder to a mixing bowl and mix well. Refrigerate for 15 minutes.
4 tablespoon Butter, ¼ cup Brown sugar, ¼ cup Sugar, ½ cup Flour, 1 teaspoon Cinnamon powder
Muffin batter: Add eggs, oil, vanilla extract, brown sugar, and cinnamon and whisk for 3 minutes.
2 Eggs, ½ cup Oil, 1 teaspoon Vanilla extract, ¾ cup Brown sugar, 1 teaspoon Cinnamon powder
Add the persimmon puree (about 1 ½ cups) and mix until combined.
Add flour, salt, baking soda, and whisk until all the ingredients are incorporated.
1 ½ cup Flour, ½ teaspoon Salt, 1 teaspoon Baking soda
Scrape the side of the bowl with the spatula and mix everything once.
Add the batter to the muffin molds.
Spoon over the crumb mixture.
Bake the muffins at 375 degrees F for 18 to 20 minutes.