Whisk together the melted butter, brown sugar, salt, pepper, garlic, and the soy sauce or coconut aminos until smooth.
Add the green beans to at least a 4-quart slow cooker. Pour the marinade over the top. Toss to coat. Secure the lid of the slow cooker and cook for 3 hours on high or 6 hours on low. If you prefer a more tender green bean, add the optional chicken stock or water to the the slow cooker for cooking your green beans.
Cook the diced bacon until crispy, if using. Remove from the skillet with a slotted spoon and add to the top of your green beans once they have finished cooking for serving.
Vegetarian and Vegan: Omit the optional bacon from the recipe.