Preheat the oven to 375 degrees.
Combine the soy milk and apple cider vinegar and set aside.
Whisk the flour, baking powder, baking soda, and salt together in a large mixing bowl.
In a separate bowl, combine the sugar, oil, vanilla extract, and curdled soy milk. Mix the dry ingredients with the wet ingredients, then add the cashews and mango.
Scoop the batter into a lightly greased muffin pan. Bake for about 30 minutes, or until golden brown.
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