Preheat oven to 400 degrees Fahrenheit (200 degrees Celsius).

Combine all dry ingredients in a large bowl and whisk together well.

Combine sour soy milk, eggs, oil, brown sugar, and maple syrup in a separate bowl. Stir in cooked sweet potatoes.

Make a well in the center of the dry ingredients and pour in the wet mixture. Stir wet and dry mixtures together. Gently fold in chopped apples, being careful not to overmix.

Pour into mini loaf pans or muffin tins sprayed with cooking spray. Sprinkle with cinnamon and sugar, if desired, unless you’re using the glaze.

Bake for 15-20 minutes or until muffins are golden and spring back when touched. Cool on a wire rack. Serve warm or room temperature.

In a small bowl, combine glaze ingredients; drizzle over warm loaves.