Easy Slow Cooker Chicken Tacos

Ingredients (9 items)

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• 1 ½ (16 ounce) packages chicken breast tenderloins
• 1 (1 ounce) package taco seasoning
• 1 (16 ounce) container mango-peach salsa
• 1 teaspoon cayenne pepper, or to taste
• 1 teaspoon chili powder, or to taste
• 1 teaspoon garlic powder, or to taste
• salt to taste
• 1 (20 ounce) can pineapple chunks, drained with juice reserved
• 1 medium onion, sliced