Ingredients
Method
Prepare the Oven and Pan
- Heat the oven to 220°C / 425°F and line a 12-cup muffin pan with paper liners. If using a dark muffin pan, reduce the second baking temperature slightly or watch the bottoms closely so they don't overbrown.
Make the Streusel
- Mix the flour, brown sugar, granulated sugar, cinnamon, ginger, and salt in a small bowl, then add the butter and mix with a fork or fingertips until small and medium clumps form. Mix in the chopped crystallized ginger. Chill the streusel while you make the batter, so it stays crumbly instead of melting flat in the oven.
Prepare the Apples
- Peel and dice the apples into small, even cubes, patting dry if very wet. Toss with 1 teaspoon of flour if the apples are especially juicy. Keeping the dice small matters here; it's what lets the apple soften fully during baking and distribute evenly through the crumb instead of leaving tunnels or wet pockets.
Mix the Dry Ingredients
- Whisk together the flour, baking powder, baking soda, salt, cinnamon, ground ginger, and nutmeg in a large bowl, mixing thoroughly so the leavening and spices distribute evenly.
Mix the Wet Ingredients
- Whisk together the melted butter, oil, brown sugar, and granulated sugar in another bowl until smooth. Add the eggs and whisk until fully combined, then whisk in the sour cream, milk or buttermilk, and vanilla, until the mixture looks smooth and glossy.
Make the Batter
- Add the wet ingredients to the dry ingredients and fold gently with a spatula just until the flour is almost incorporated. Add the diced apples and chopped crystallized ginger, folding only until evenly distributed with no dry streaks remaining. Don't overmix; the batter should be thick and scoopable, since overmixing makes the muffins tougher and reduces their dome.
Fill and Top
- Divide the batter evenly among the 12 muffin cups, filling nearly to the top for bakery-style domed muffins. Scatter the streusel generously over each one, pressing very lightly so it adheres, and add a light sprinkle of coarse sugar over the streusel if desired.
Bake
- Bake at 220°C / 425°F for 5 minutes, then lower the oven to 190°C / 375°F without opening the door, and continue baking for 15 to 19 minutes, until the tops are high, golden, and craggy, the streusel is set and lightly browned, and a tester inserted into the muffin portion comes out clean or with a few moist crumbs. Avoid testing directly through a large apple piece, which can make the center seem underbaked when it isn't.
Cool
- Cool the muffins in the pan for 8 to 10 minutes before transferring to a rack. Let them cool a bit more before serving, so the crumb can set and the apple pieces finish steaming inside.
Notes
Firm apple varieties like Honeycrisp, Pink Lady, Braeburn, or Granny Smith hold their shape through baking, unlike softer apples that tend to break down into mush.
Crystallized ginger gives a clearer, more defined ginger flavor with small warm, spicy bursts throughout the crumb. Fresh ginger works as a substitute, but it brings a wetter, sharper heat and less of that sweet definition.
Using both butter and oil in the batter gives a better flavor than oil alone while keeping a softer, moister crumb than butter alone would produce.
Very juicy apples shouldn't be used in a larger quantity than called for; the extra moisture can leave the interior damp and gummy rather than tender.
