Preheat oven to 400°F
Crumble muffins onto a sheet tray and drizzle melted butter over top.
Pop into oven, brown until crispy and golden in color, 8-10 minutes. Give it a shake every now and then so that they toasts evenly. Reserve for topping.
Preheat a medium-sized skillet over medium-high heat with 3 tablespoons of butter. Once the butter has melted, add apples and brown sugar. Cook, stirring frequently, for about 5 minutes or until the apples are tender.
Add the lemon juice and then remove from the heat. Divide the apples between 4 dessert bowls and top with the toasted muffin. Serve with whipped cream or some vanilla ice cream.