Sift together flour, baking powder, baking soda, and salt. Combine sugar, oil, eggs, and yogurt. Add wet ingredients to dry ingredients and mix just until batter comes together. Add add-ins.
Divide batter between the 12 muffin cups. Cups should be full. Bake for 18-20 minutes, until a toothpick inserted into bottom of muffin comes out clean. Remove from oven and immediately turn muffins onto their sides so that steam can escape.