Slow Cooker Lentil Soup with Bacon

slices bacon (thinly sliced)

lentils (rinsed and sorted)

celery stalks (diced)

carrots (diced)

medium onion (diced)

garlic (minced)

smoked paprika

red chili flakes

can fire roasted diced tomatoes

chicken broth (low sodium)

fresh chopped parsley (optional garnish)