Lightly butter a 9-inch pie plate.
Combine crushed pretzels, melted butter, and sugar in a small bowl; then press firmly into bottom and up the sides of the pie plate, creating an even thickness. Refrigerate pie crust while making filling.
In a large bowl, combine sweetened condensed milk, lime juice, tequila, and Triple Sec; mix well. Fold in whipped cream. Pour into prepared crust.
Cover pie and either freeze for 4 hours or refrigerate 2 for hours.
If frozen, soften in refrigerator slightly before serving. Decorate with lime slices. Freeze or refrigerate any leftover pie.
Makes 1 (9-inch) pie.
Margarita Pie Recipe: https://whatscookingamerica.net/janebutel/margaritapie.htm