Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or lightly grease it.
In a large bowl, whisk together the flour, cinnamon, cardamom, baking soda, and salt to combine evenly.
In a separate bowl, mix the pumpkin puree, sugar, vegetable oil, and eggs until smooth and well combined.
Pour the wet mixture into the dry ingredients and gently fold everything together until just combined; do not overmix to keep the muffins tender.
Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
Sprinkle pumpkin seeds and a touch of brown sugar on top of each muffin for a crunchy, sweet topping.
Bake in the preheated oven for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean and the tops are golden brown.
Remove the muffins from the oven and let them cool in the tin for a few minutes before transferring to a wire rack.
Enjoy these moist, spiced pumpkin muffins warm or at room temperature, with their fragrant aroma filling the kitchen.