Tomato and White Bean Stew on Toast

Ingredients

• 1 tablespoon extra-virgin olive oil, plus more as needed for finishing
• 1 tablespoon unsalted butter
• 1 red onion, diced
• 1 yellow bell pepper, minced
• 3 garlic cloves, minced
• 2 tablespoons harissa
• One 28-ounce can crushed tomatoes
• 2 teaspoons sweet or hot paprika
• 1 teaspoon ground coriander
• Kosher salt and freshly ground black pepper
• 28 ounces drained cooked white beans
• 6 thick slices sourdough bread
• ½ cup chopped fresh parsley
• ½ cup finely sliced scallions