Now, let’s explore how to create this delightful treat. Buckle up for the tasty ride ahead!

Start by preheating your oven to 350°F (175°C). This ensures even baking! While it heats up, you can prepare your muffin pan. Greasing it or lining with muffin cups prevents sticking, making life a little easier.

In a mixing bowl, combine the melted butter, pumpkin pie spice, optional ground cinnamon, flour, and brown sugar. Stir until it resembles crumbly sand. Set this aside; it will become a crunchy crown for your muffins.

In another bowl, whisk together the flour, baking powder, pumpkin pie spice, and optional nutmeg. This step combines the leavening agents with the flavors, ensuring an even mix throughout your muffins.

In a large mixing bowl, combine the pumpkin puree, eggs, melted butter, vegetable oil, brown sugar, milk, and vanilla extract. Mix these ingredients until smooth. The blend of pumpkin and eggs provides the moisture necessary for a tender muffin.

Gradually add the dry mixture to the wet ingredients. Stir until just combined; being careful not to overmix. A few lumps are perfectly fine as they will bake out.

Spoon the batter into the prepared muffin pan, filling each cup about two-thirds full. This gives enough room for the muffins to rise without overflowing.

Now, sprinkle the streusel topping generously over each muffin. This will bake to a golden, crunchy goodness on top.

Bake the muffins for about 20-25 minutes, or until a toothpick inserted comes out clean. Allow them to cool in the pan for a few minutes before transferring to a wire rack to cool completely.