Step 1

Line an 8×8-inch baking pan with a parchment paper sling, leaving several inches of overhang on 2 sides. Melt 6 tablespoons unsalted butter in a large saucepan over medium-low heat. Stir in 1 (10-ounce) package mini marshmallows, 1/2 teaspoon vanilla extract, 1/4 teaspoon almond extract, and 1/4 teaspoon kosher salt until melted. Turn off the heat.

Step 2

Gently fold in 6 cups rice crisp cereal (such as Rice Krispies) and 1 cup rainbow sprinkles until completely coated. Transfer mixture to prepared pan and press into an even layer. Cool 1 hour before cutting into 16 squares.