Preheat oven to 350 degrees. Thoroughly mist two 12 cup nonstick mini muffin tins with butter-flavored cooking spray (or use paper liners). Using a whisk or spatula, mix the applesauce, vanilla, egg whites, and sugar until well combined in a large mixing bowl.
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Add the flour, baking powder, cocoa, espresso powder, and salt. Stir until just combined and smooth. Using half the batter, fill each muffin cup until just barely full. Sprinkle half the chips evenly over top. Bake 10 to 12 minutes, or until a toothpick inserted in the center comes out clean.
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