Step 1

In a medium bowl, combine both sugars, the cinnamon, and melted butter. Using a rubber spatula, stir in the flour. The crumb topping will be thick and crumbly. Set aside.

Step 2

Preheat oven to 425°F (218°C). Spray a 12-count muffin pan with nonstick spray or line with cupcake liners. You may need a 2nd pan as this recipe makes up to 14 muffins, though you can always bake in batches using 1 pan. Set aside. *See note about jumbo size muffins.

Step 3

Using a handheld or stand mixer fitted with a paddle attachment, beat the butter and both sugars together on high speed until smooth and creamy, about 2 minutes. Scrape down the sides and bottom of the bowl as needed. Add the eggs, yogurt, and vanilla extract. Beat on medium speed for 1 minute, then turn up to high speed until the mixture is combined and uniform in texture. Scrape down the sides and bottom of the bowl as needed.

Step 4

Whisk the flour, baking soda, baking powder, cinnamon, and salt together in a medium bowl. Pour the dry ingredients into the wet ingredients, add the milk and apple, and mix on low speed until everything is combined.

Step 5

Spoon the batter evenly into each cup or liner, filling each all the way to the top. Press a handful of the crumb topping into the top of each; crumble it with your hands to make some big chunks.

Step 6

Bake for 5 minutes at 425°F (218°C) degrees, then keeping the muffins in the oven, lower the oven temperature to 350°F (177°C) and bake for 15-17 more minutes or until a toothpick inserted in the center comes out clean. The total time these muffins take in the oven is about 20-22 minutes.

Step 7

whisk all of the ingredients together and drizzle over warm muffins.

Step 8

Muffins stay fresh stored at room temperature for a few days– then transfer to the fridge for up to 1 week.