Enjoy this salty-sweet fudgy treat with a cold glass of milk. This fudge will also make a statement on the dessert table — the pretzels make a beautiful lacey pattern.
Prepare an 8-inch square pan by lining it with aluminum foil, set aside.
Combine the sweetened condensed milk and semi-sweet chocolate in a microwave-safe bowl, and microwave on high for about 1 ½ minutes, stirring every 30 seconds or so, until the chocolate is melted. Stir in the vanilla extract and pretzels, reserving about a 1/3 for the topping.
Pour the fudge into the prepared pan, and sprinkle with the remaining pretzels. Cover and refrigerate the fudge for at least 2 hours, or until it is firm. Then, slice and serve.