Maple Tuna Olive Toastie

By Katie

4.83 / 5

10min

15min

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2 tablespoons butter
½ large sweet red onion thinly sliced
1 tablespoon maple syrup
2 (5 ounce) cans tuna drained
2 tablespoons creamy salad dressing (such as Miracle Whip®)
salt and ground black pepper to taste
1 (12 ounce) loaf Italian olive bread
8 ounces shredded Cheddar cheese