1½ tablespoons unsalted butter, cold and cut into cubes
1½ tablespoons light brown sugar (for streusel)
2 teaspoons granulated sugar (for streusel)
Pinch salt (for streusel)
¼ teaspoon ground cinnamon
1½ tablespoons diced apples (reserved)
1½ tablespoons full-fat sour cream, room temperature
5 tablespoons pure canned pumpkin
1 tablespoon apple juice
3 tablespoons granulated sugar
2 tablespoons light brown sugar
1 large egg yolk, room temperature
½ teaspoon vanilla extract
½ cup fresh apple, cut into small cubes
½ cup plus 1 tablespoon all-purpose flour
¼ teaspoon baking soda
⅛ teaspoon salt
¾ teaspoon pumpkin pie spice
Instructions
Combine flour, butter cubes, both sugars, salt, and cinnamon in small bowl. Cut butter into flour until pea-sized crumbly pieces form. Stir in 1½ tablespoons finely diced apples and refrigerate.
Preheat oven to 425°F and line muffin pan with 4 liners.
In medium bowl, whisk together sour cream, pumpkin, apple juice, both sugars, egg yolk, and vanilla until smooth. Fold in remaining apple cubes.
In small bowl, whisk flour, baking soda, salt, and pumpkin pie spice. Sprinkle over wet mixture and fold until just combined.
Divide batter evenly among 4 muffin liners. Top each with streusel mixture.
Bake at 425°F for 5 minutes, then reduce to 350°F and bake 11-13 minutes until toothpick comes out mostly clean.
Cool in pan 10 minutes, then transfer to wire rack to cool completely.
Notes
Use pure pumpkin puree, not pumpkin pie filling for best results.
Don’t overmix batter to avoid tough muffins. Full-fat sour cream creates the most tender texture.
Recipe doubles easily for larger batches using standard 12-cup muffin pan.