Ingredients
Equipment
Method
Prep the oven and muffin tin
- Preheat oven to 375°F and line a muffin tin with paper liners.
Make the streusel topping
- Mix brown sugar, flour, and cinnamon, then cut in cold butter until crumbly; set aside.
Mix the dry ingredients
- Whisk all-purpose flour, baking soda, baking powder, cinnamon, nutmeg, and salt together.
Mix the wet ingredients
- Beat brown sugar, eggs, vegetable oil, sour cream or Greek yogurt, and vanilla extract together, then fold in diced apple.
Combine batter and bake
- Combine wet and dry ingredients and stir just until no dry flour remains—do not overmix.
Portion and finish
- Divide batter among muffin cups, top each with streusel, and bake for 18–22 minutes at 375°F until a toothpick comes out clean.
Notes
For taller, domed muffins, stop mixing as soon as the last streak of dry flour disappears—lumps are fine. Store airtight at room temperature for 2 days or in the fridge for up to 5 days; rewarm 10–15 seconds in the microwave. Freeze up to 2 months (wrap individually), then thaw overnight in the fridge. For a lighter option, use Greek yogurt in place of sour cream.
