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Preheat oven to 350 degrees. Mix sugar, cinnamon, and melted butter together. Spread the mixture on a parchment-lined baking sheet in a thin, even layer and bake for 15-20 minutes, or until crisp. Set aside and allow to cool. Once cooled, break into bite-sized pieces.
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In a bowl, mix heavy cream, half and half, brown sugar, vanilla extract, cinnamon, and salt together. Pour into a chilled ice cream maker, and follow the directions of your ice cream maker.
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Once the ice cream has thickened and is almost finished (for my ice cream maker it was about 20 minutes), drizzle in 1/4 to 1/2 cup dulce de leche, depending upon your preference. Next, add in cinnamon sugar pieces.
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If you like your ice cream soft-serve, eat it right away, or store in an airtight container for 3-4 hours in the freezer.
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Enjoy!