Preheat oven to 375 degrees. If your oven tends to run hotter than average, preheat to 350 degrees. Line 2 baking sheets with parchment paper.
Combine sugar and cinnamon. If you have a shaker, that's helpful to use for distributing the cinnamon-sugar. Otherwise a spoon is fine.
Place tortillas on a cutting board. Brush both sides of each tortilla with melted butter and sprinkle one side with cinnamon-sugar to cover lightly. Spread with fingertips if needed. Stack tortillas and cut into wedges or strips or use cookie cutters to cut in decorative shapes.
Transfer to baking sheets cinnamon-side up in one layer and bake for 10** minutes or until lightly browned. Tortillas will crisp further out of the oven. Allow to cool on pan.
Combine mango and strawberries in a bowl. Mix in mint and lime juice, if desired. Place fruit salsa in center of platter and surround with tortilla chips.