Slow Cooker Chicken with Tomatoes and Bell Peppers

bone-in, skin-on chicken thighs

large onion, thinly sliced

whole roma tomatoes, diced

 celery stalk, chopped

yellow bell pepper, cut into strips

red or white wine vinegar

cup (60ml) chicken stock 

small can of tomato paste

honey

olive oil

minced fresh garlic

 tablespoon Italian seasoning

Salt and fresh cracked pepper,

crushed red pepper flakes

Fresh parsley, for garnish

Chopped scallion, for garnish