If desired, rim the glass with salt or sugar by running a lime wedge around the edge and dipping into a plate of salt or sugar.
In a cocktail shaker, combine tequila, orange liqueur, lime juice, peach puree, and simple syrup.
Fill the shaker with ice, cover, and shake vigorously for about 15 seconds.
Strain into a glass filled with fresh ice.
Garnish with a lime wedge and peach slice. Serve immediately and enjoy!