Rice Krispie Treats

Grease a 9×13-inch baking pan with butter or nonstick spray and set aside.

Melt the 3 tbsp unsalted butter in a large pot over medium-low heat, stirring occasionally until fully melted.

Add the 10 oz mini marshmallows to the pot and stir constantly until completely melted and smooth, about 4–5 minutes. Remove from heat immediately.

Stir in the ¼ tsp fine salt and 1 tsp vanilla extract until combined.

Add the 6 cups Rice Krispies cereal all at once and fold quickly with a silicone spatula until every piece is evenly coated.

Transfer the mixture to the prepared pan. Using lightly buttered hands or a buttered spatula, press the mixture into an even layer — firm enough to hold shape, but don't compress too hard or the treats will be dense.

Let the pan sit at room temperature for at least 30 minutes until fully set, then cut into 12 squares and serve.