Yields: 16 servings Prep time: 15 minutes Cooling time: 1 hour Total time: 1 hour 15 minutes Ingredients: 6 tablespoons unsalted butter ¾ teaspoon coarse Kosher salt (or ½ teaspoon table salt) 1 teaspoon vanilla extract 10 ounces mini marshmallows (about 6 ½ cups) 4 cups Rice Krispies cereal ¼ cup sprinkles (for this recipe I used Valentine's Day sprinkles) Instructions: Prepare the pan: Lightly grease the bottom and sides of an 8 inch baking pan with butter. Lightly grease your mixing bowl and spatula as well. Brown the butter: In a saucepan, melt the butter over medium heat. Continue cooking, swirling the pan occasionally, for about 5 minutes. The butter will foam and brown, and the water will evaporate. Scrape up the browned bits with a spatula and stir them into the butter. Reduce heat to low. Melt marshmallows: Stir in the salt and vanilla extract. Add the marshmallows and stir frequently over low heat until melted, leaving a few slightly unmelted for gooeyness. Combine...