Deconstructed Stuffed Peppers

Name: Deconstructed Stuffed Peppers
Ingredients: 1 1/2 pounds ground beef; 1 cup frozen cooked white rice, thawed; 1 cup shredded monterey jack or pepper jack cheese (about 4 ounces); 2 cloves garlic, finely grated; 3 scallions, thinly sliced, 2 tablespoons dark green parts reserved for topping; 1 1/2 teaspoons paprika; Kosher salt and freshly ground pepper; 1 16-ounce package baby bell peppers; 2 tablespoons extra-virgin olive oil, plus more for drizzling and brushing; 2 small romaine hearts, trimmed and halved lengthwise; 4 teaspoons red wine vinegar; 1/2 teaspoon Dijon mustard