1. Preheat oven to 375 degrees Fahrenheit. Line a 12-cup muffin tin with paper liners, or grease with nonstick spray. Set aside.
2. Add all wet ingredients (yogurt, egg, honey, melted oil, vanilla) to a mixing bowl and whisk to combine. Then, add all remaining ingredients, including chopped strawberries, and stir just to combine. Some small lumps of cornmeal are fine.
3. Use a 1/3 cup measuring cup to portion out the muffins into the prepared pan. Sprinkle the top of each muffin with a pinch of sugar.
4. Bake for 18-20 minutes, or until muffins start to turn golden around the edges and are cooked through. Transfer muffins to a wire rack to cool, then store leftovers in an airtight container at room temperature for up to 2 days, in the fridge for 5 days, or in the freezer for up to 2 months. Muffins are best eaten the day they're baked, but leftovers reheat well in a pan with a little butter.