Making these delicious Apple Pumpkin Streusel Muffins is a breeze when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.

2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.

3. Combine Sugars: In another large bowl, mix the granulated sugar, brown sugar, and vegetable oil until smooth.

4. Add Eggs: Beat in the eggs one at a time, ensuring they are well combined.

5. Incorporate Pumpkin: Add the pumpkin puree and vanilla extract, mixing until everything is thoroughly combined.

6. Combine with Dry Ingredients: Gradually add the dry ingredient mixture into the wet mixture, stirring gently just until no flour streaks remain.

7. Fold in Apples: Gently fold in the diced apples until evenly distributed within the batter.

8. Prepare Streusel: In a small bowl, mix the flour, brown sugar, and cinnamon for the streusel. Add the cold cubed butter and mix with your fingers or a pastry cutter until crumbly.

9. Fill Muffin Tin: Divide the muffin batter evenly into the lined muffin cups, filling each about 2/3 full.

10. Top with Streusel: Evenly sprinkle the streusel topping over each muffin.

11. Bake: Place the muffin tin in the preheated oven and bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.

12. Cool: Remove from the oven and let them cool in the muffin tin for 5-10 minutes before transferring to a wire rack to cool completely.

This method guarantees that you’ll produce Apple Pumpkin Streusel Muffins that are moist, fluffy, and utterly delicious—perfect for sharing!