Add syrup, water, and butter to the jar of a blender (or bowl of a food processor).
Add dry milk and blend until smooth, about 20-30 seconds on high, scraping at the halfway point. (Mixture will seem runny.)
Pour the mixture into a 16-ounce glass jar or container with an airtight lid. Refrigerate until chilled and slightly thickened, at least 3 to 4 hours (preferably overnight).
Can store in fridge for 1 to 2 weeks.
Makes 14-ounces which is equal to 1 commercial can to use in your recipes.
Notes
*Can substitute honey (stronger flavor) or fine cane sugar.Variations (both are cooked, though):
To use evaporated milk instead of dry milk: Add a 12-ounce can of evaporated milk with the maple syrup in a large saucepan and bring to a boil over medium-high heat. Reduce heat and simmer for 30 minutes, stirring often. Then let cool slightly before using it in a recipe.
Dairy free alternative with coconut milk – Use a 13.5 ounce can of full fat coconut milk and the maple syrup to make a sweetened condensed milk alternative (will taste a bit of coconut). Bring both to a boil in a large saucepan and then simmer 40-45 minutes until thickened by about half, stirring often to prevent burning.