Preheat the oven to 400 degrees F. Line a rimmed baking sheet with foil and lightly oil the foil.
Melt the butter in a saute pan over medium heat. Add the pepitas, toss to coat in the butter and then add the sugar, cinnamon, ginger, allspice, cloves and 1 teaspoon salt. Spread the pepitas on the prepared baking sheet in 1 layer and bake, stirring once or twice, until golden brown all over, 12 to 15 minutes. Let cool completely.