Preheat your smoker to 225°F using high-quality hardwood like hickory or applewood.
Pat the baby back ribs dry with a paper towel and remove the silver skin membrane from the back of the rack if necessary.
In a small bowl, combine the smoked paprika, garlic powder, onion powder, sea salt, and black pepper to create a clean dry rub.
Apply the spice rub generously to all sides of the ribs, pressing it into the meat to ensure it adheres well.
Place the ribs in the smoker and cook for approximately 3 to 4 hours, or until the meat is tender and begins to pull away from the bone.
While the ribs smoke, whisk together the tomato paste, apple cider vinegar, Dijon mustard, and maple syrup in a small saucepan over low heat until smooth.
During the last 30 minutes of cooking, brush the tangy glaze onto the ribs and allow it to caramelize into a sticky coating.
While the ribs finish, steam the green beans for 5-7 minutes until they are bright green and snappy.
Remove the ribs from the smoker, let them rest for 5 minutes, then slice and serve with the steamed green beans.