Chop nectarines into about ½-inch or smaller chunks. Peeling is optional (I don’t peel the nectarine—we don’t mind it!).
In a small saucepan, add water, cinnamon, brown sugar and nectarines. Stir to combine.
Over medium heat, bring mixture to a boil, stirring often so as to avoid burning. Simmer for about 5 minutes then stir in blueberries until combined. Heat for about 5 more minutes, until berries are warmed through.
Remove from heat and serve over pancakes, ice cream, in crepes or whatever!