Apple, Banana, and Cranberry Crumble - Jazzy Vegetarian - Vegan and Delicious!

Ingredients

• 1 teaspoon extra-virgin olive oil (for coating casserole dish)
• 4 medium tart green and/or sweet red apples, cored and sliced (do not peel)
• 4 heaping tablespoons sweetened dried cranberries
• 3½ tablespoons maple syrup
• 1 rounded teaspoon ground cinnamon
• 1 very large ripe banana, peeled (see note)
• 1 tablespoon maple syrup, plus more for serving
• 1¼ cups quick cooking or old fashioned rolled oats (use gluten-free if needed)