These easy and delicious apple cinnamon muffins are made with fresh apples and spices, and topped with an easy streusel topping. So good!
Preheat oven to 425 degrees F. Grease a 12-muffin tin with cooking spray or butter, and set aside.
Dry ingredients: In a large bowl, whisk all-purpose flour, granulated sugar, brown sugar, baking soda, baking powder, salt, ground cinnamon, and ground nutmeg (if using) until evenly combined. Set aside.
Wet ingredients: In a separate large bowl, mix the melted butter, Greek yogurt, milk, eggs, and vanilla extract until well combined.
Add the wet ingredients to the dry ingredients, and mix until evenly combined without overmixing. Using a rubber spatula, fold in the diced apples into the batter until just combined. Set aside.
Make the streusel topping: In a bowl, whisk the streusel topping’s dry ingredients (flour, brown sugar, granulated sugar, ground cinnamon, and salt). Then, gradually drizzle in the melted and cooled butter, whisking with a fork as you add the butter. This will prevent large clumps from forming. You’re looking for somewhat moist crumbles.
Fill the prepared muffin pan with the batter, almost all the way to the top. Sprinkle the prepared streusel on top.
Bake at 425 degrees F for 5 minutes to get that high muffin top quickly (middle rack). Then reduce oven temperature to 350 degrees F and bake for 15-18 minutes or until a toothpick inserted in the middle comes out clean.
Remove from oven. Let cool slightly and enjoy!