Prepare the cinnamon-sugar mixture: In a small microwavable bowl, combine 1 tablespoon of ground cinnamon and 1 tablespoon of sugar. Add 2 tablespoons of butter on top of the mixture and microwave for 20 to 30 seconds, or until the butter is melted and the mixture is well combined. Stir to ensure the cinnamon and sugar are evenly incorporated into the butter.
Prepare the apples: Slice 2 medium apples in half and remove the cores. Place the apple halves cut side up in a baking pan or on a baking sheet lined with parchment paper for easy cleanup.
Top the apples: Evenly sprinkle 2 tablespoons of chopped walnuts over the apple halves. Drizzle the cinnamon-sugar mixture over the apples, ensuring each half is well-coated.
Bake: Place the baking pan or sheet in the preheated oven and bake for about 30 minutes, or until the apples are tender and slightly caramelized. You can test tenderness by gently poking the apples with a fork.
Serve: Once done, remove the apples from the oven and let them cool slightly before serving.
Notes
Leftovers: Store any leftovers in the fridge for 2-3 days. For the best taste and texture, reheat them in the oven for a few minutes at 350°F.
Other Toppings: For an extra indulgent treat, top with a scoop of vanilla ice cream or whipped cream just before serving.