Ingredients
Method
Prepare the Streusel Topping
- In a small mixing bowl, combine the flour, rolled oats, brown sugar, and ground cinnamon.
- Add the cold cubed butter and cut in using a pastry cutter, fork, or your fingertips until coarse, pea-sized buttery crumbs form. Place in the refrigerator while making the muffin batter to keep cold and crispy.
Mix the Muffin Batter & Fold in Apples
- Preheat your oven to 425°F (220°C). Line a 12-cup standard muffin tin with parchment paper tulip liners or grease thoroughly.
- In a large bowl, whisk together the flour, sugar, baking powder, baking soda, ground cinnamon, nutmeg, and sea salt until thoroughly combined.
- In a medium bowl, whisk together the eggs, melted butter, Greek yogurt, milk, and vanilla extract until smooth.
- Pour the wet ingredients into the dry ingredients. Stir with a spatula just until barely combined (a few flour streaks are fine). Gently fold in the finely diced fresh apples without overmixing.
Fill Muffin Cups, Top with Streusel & Bake
- Divide the batter evenly among the 12 muffin cups, filling them all the way to the top rim (this ensures sky-high bakery domes).
- Generously pile the chilled cinnamon oat streusel over the top of each muffin, pressing down very gently so it adheres.
- Bake at 425°F (220°C) for 5 minutes. Then, keeping the oven door closed, reduce the oven temperature to 350°F (175°C) and bake for an additional 15 to 17 minutes, until the streusel is golden brown and a toothpick inserted into the center comes out clean.
- Cool in the pan for 5 minutes, then transfer to a wire cooling rack. If desired, whisk the powdered sugar, milk, and vanilla together and drizzle over the warm muffins before serving!
