Preheat your oven to 350 °F (175 °C).
Line a standard 12-cup muffin tin with muffin liners.
In a mixing bowl, combine crushed graham crackers, brown sugar, ground cinnamon, ginger, and nutmeg until well mixed. Gradually drizzle melted butter into the mixture while stirring until it resembles wet sand.
Spoon about 2 tablespoons of the crust mixture into each lined muffin tin cup. Use the back of a small spoon to firmly compact the mixture into an even layer at the bottom of each liner.
Place the muffin tin in your preheated oven and bake for approximately 5-8 minutes until lightly browned. Once done, remove from oven and allow them to cool while you prepare the filling.
In a separate bowl, blend cream cheese, brown sugar, vanilla extract, spices, and pumpkin puree until smooth before adding eggs one at a time, ensuring each is fully incorporated before adding the next. Divide this creamy filling evenly among each muffin cup and return them to bake at 325 °F (163 °C) for about 22 minutes before cooling completely on a rack and refrigerating overnight.