Place peaches in ovenproof dish large enough to hold them; add 1 tbsp (15 mL) of the melted butter, turning to coat peaches. Bake in 400°F (200°C) oven, turning occasionally, for 20 to 30 minutes, or until tender. Peel if desired, but it is not necessary.

In large frying pan over medium heat, stir remaining butter with brown sugar. Add peaches, turning to coat; cook until caramelized with sugar mixture, about 2 minutes.

In small saucepan, heat custard, stirring, over low heat, just until warm. Pour about 1/4 cup (50 mL) onto each dessert plate; top with peach. Sprinkle with cinnamon. Serve warm.