The earthiness of roasted peanuts is an unexpectedly perfect match for smoky adobo sauce. The flavor intensifies as the nuts bake.
Preheat oven to 350 degrees. Combine adobo sauce, butter, and 1/4 teaspoon salt in a large bowl. Add peanuts, and toss to coat using a rubber spatula.
Transfer peanut mixture to a parchment-lined baking sheet, and spread in a single layer using spatula. Bake, stirring occasionally, until adobo sauce deepens in color and peanuts are toasted, about 20 minutes.
Transfer sheet to a wire rack, and let stand until cool and hardened, about 30 minutes.
Nuts can be stored in an airtight container for up to 2 weeks.