Slow Cooker Chicken Fajitas

Ingredients (21)

• + 2 ½ pounds frozen skinless, boneless chicken breasts add to pantry
• + 1 (14.5 ounce) can diced tomatoes, well drained add to pantry
• + 1 (8 ounce) jar salsa add to pantry
• + 2 teaspoons chili powder add to pantry
• + 1 teaspoon salt add to pantry
• + 1 teaspoon ground paprika add to pantry
• ✓ 1 teaspoon white sugar
• + 1 teaspoon onion powder add to pantry
• ✓ 1 teaspoon garlic powder
• + ¾ teaspoon chicken bouillon granules add to pantry
• + ½ teaspoon ground cumin add to pantry
• + ¼ teaspoon cayenne pepper add to pantry
• + 1 pinch red pepper flakes, or to taste add to pantry
• + 2 onions, sliced into thin strips add to pantry
• + 1 red bell pepper, sliced into strips add to pantry
• + 1 yellow bell pepper, sliced into strips add to pantry
• + 1 green bell pepper, sliced into strips add to pantry
• ✓ 2 tablespoons cornstarch
• + 1 (15 ounce) package flour tortillas add to pantry
• + 1 (8 ounce) package shredded Cheddar Jack cheese add to pantry
• + ½ cup sour cream, or to taste add to pantry