Preparation Steps

• Preheat oven to 400°F (200°C). Line a muffin tin with paper liners.
• In a large bowl, whisk together the flour, sugar, baking powder, baking soda, cinnamon, and salt.
• In a separate bowl, whisk together the milk, oil, and egg.
• Add the wet ingredients to the dry ingredients and stir until just combined. Fold in the diced apples and walnuts (if using).
• Fill the muffin liners about 2/3 full.
• Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
• Let the muffins cool in the muffin tin for a few minutes before transferring them to a wire rack to cool completely.