Add all of the ingredients to your slow cooker and stir to combine them.
2 lbs fresh collard greens, 1 15.5 oz. can fire roasted diced tomatoes, 2 tsp minced garlic, 1 cup white onion, 1½ tbsp organic cane sugar, 2½ tsp sea salt, 1 tsp black pepper, 1 tsp red pepper flakes, ½ tsp paprika, 1 tsp liquid smoke, 1½ cups vegetable broth