Preheat oven to 375 F. Spray muffin tins with nonstick spray. Combine dry ingredients in mixing bowl and stir together. Add oil, yogurt, egg, vanilla and stir. Add boiling water, stir, and let sit for about five minutes. Fold in blueberries. Spoon batter into two 12-muffin tins. Bake until toothpick inserted into muffin comes out clean, about 20 minutes. Cool for 10 minutes, remove from tins, cool on rack.
