Combine all ingredients in a 2-quart slow cooker. Cover and cook on high setting 15 minutes. Turn to low setting anc cook, uncovered, 2 hours, stirring occasionally. Transfer nuts to a baking sheet; cool completely. Store in an airtight container. Makes 4 1/2 cups.
Variation: For a smoky flavor, substitute one tablespoon Spanish smoked paprika for the chili powder in this recipe.