Preheat oven to 350℉. Place par-baked crust on foil lined baking sheet and set aside.
In a small saucepan, cook the butter over medium-low heat to brown. Stir constantly with a rubber spatula until butter is foaming and solids turn a dark brown (5-7 minutes).
Remove saucepan from heat and add honey, stirring to combine. Cook on medium for about 2 minutes, until honey has darkened and has a nutty smell. Remove from heat and stream in heavy cream, stirring constantly until fully mixed. Set aside.
In a large bowl, whisk eggs to break up whites and yolks, then add brown sugar and whisk vigorously until mixture has lightened a shade or two. Whisk in pumpkin, cinnamon, ginger, vanilla, salt, allspice, cloves, and nutmeg until smooth. Slowly stream in warm honey mixture and whisk until combined.
Fill crust all the way to the top and bake on center rack for 45-60 minutes, until edges of filling is set and puffed, and center has a gentle wobble.
Turn off oven and prop open with a wooden spoon. Let pie cool completely in the oven to prevent any cracks.
To serve, slice pie and serve with whipped cream. Enjoy!