Preheat the oven to 375°F. Grease a 24-cup mini muffin pan with nonstick spray.
In a medium bowl, stir together the flour, baking powder, baking soda, and salt.
In another bowl, combine the yogurt, maple syrup, eggs, butter, and vanilla.
Gently fold the yogurt mixture into the flour mixture.
Stir in the chocolate chips.
Divide the batter evenly among the muffin cups, filling them to the edge (about 1 ½ tablespoons per mini muffin cup).
Bake for 10-12 minutes, or until the edges are lightly golden and a cake tester inserted into the center comes out clean. Be sure not to overbake.
Remove from the oven and let the muffins cool in the pan for 2 minutes. If needed, run a paring knife around the edges to loosen them, then carefully transfer the muffins to a wire rack to cool completely.