Preheat oven to 375 °F (190 °C). Prepare a 12‑cup muffin tin with liners or spray.
In a blender, puree mango, ginger, orange zest, molasses, eggs, sour cream, butter, and vanilla until smooth.
In a large bowl, whisk almond flour, coconut flour, baking powder, baking soda, salt, and Splenda.
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Divide batter among muffin cups and top with pistachios if using.
Bake 16–18 minutes, or until tops are golden and a toothpick comes out clean.
Cool 5 minutes in tin, then transfer to a rack to cool completely before serving.