Rim a margarita glass with lime juice and dip into salt or cinnamon sugar. Set aside.
Fill a cocktail shaker with ice and add tequila, orange liqueur, mango puree, lime juice, and cinnamon syrup.
Shake vigorously for 15-20 seconds until well chilled.
Strain into the prepared margarita glass filled with fresh ice.
Garnish with a mango slice, lime wedge, or a dash of cinnamon on top.
Serve immediately and enjoy!