Browned Butter Rice Krispies Treats

Regional science fair week. We competed at a facility near the LSU campus on Saturday and I spent Thursday and Friday running through my presentation until I could do it in my sleep, which is the goal — not to memorize it but to internalize it, to know it well enough that the words come from understanding rather than rote recall. I can explain the Maillard reaction in five different ways at five different levels of complexity. I can explain it to a seventh grader and to a chemistry teacher and to a grandmother who has been making dark roux for fifty years. I practiced all three versions.

The regional fair was bigger than the school competition in every way — more projects, more judges, more noise. I set up my display and then waited while the judges made their rounds. There were two separate rounds of judging: a preliminary round where they read everything and asked basic questions, and a final round where the top projects were asked to present in full and answer extended questions. I made it to the final round.

In the final round I presented for ten minutes and answered questions for another ten. The judges were a university professor, a food scientist from LSU AgCenter, and a high school teacher. The food scientist asked me how I controlled for the roux-maker's effect on the outcome, since a consistent maker might produce consistent results regardless of timing. I said I had addressed this by using a standardized protocol that I followed exactly, but that the food scientist's point was an interesting methodological limitation that I would include in the limitations section of a revised write-up.

I placed second overall. The project that beat mine was a study of water filtration efficiency across different media, which was excellent, and I said so to the winner because it was true and because you should say true things. I called MawMaw Shirley from the parking lot. She said second in the region is fine. I said I would win the state fair next year. She said she expected nothing less.

I called MawMaw Shirley from the parking lot and told her I’d place first at state next year, and I meant it — but when I got home that evening, I needed to make something with my hands, something that used the exact same chemistry I’d spent months explaining to judges. Browning butter on the stovetop is the Maillard reaction in its simplest, most honest form: heat, amino acids, sugars, and patience, just like a dark roux, just like everything I love about Louisiana cooking. These browned butter Rice Krispies Treats were my quiet celebration, my way of closing the loop between the science fair table and MawMaw’s kitchen where all of this started.

Prep Time: 5 minutes | Cook Time: 15 minutes | Total Time: 20 minutes | Servings: 16 bars

Ingredients

6 tablespoons unsalted butter, plus more for greasing the pan
1 teaspoon pure vanilla extract
1/4 teaspoon fine sea salt
10 oz marshmallows (about 40 regular or 4 cups mini), divided
6 cups Rice Krispies cereal

Instructions

Prepare the pan. Lightly butter a 9x13-inch baking pan and set it aside. Have all your ingredients measured and ready before you start — the process moves quickly once the butter begins to brown.
Brown the butter. Melt the butter in a large, heavy-bottomed saucepan or Dutch oven over medium heat. Continue cooking, stirring occasionally, until the butter foams, then the foam subsides, and the milk solids at the bottom turn a deep golden-amber and smell nutty and rich — about 5 to 7 minutes. This is the Maillard reaction at work: don’t rush it, and don’t walk away.
Melt most of the marshmallows. Remove the pan from heat and immediately add the vanilla and salt. Add all but 1 cup of the marshmallows and stir vigorously until completely melted and smooth. The residual heat will do the work.
Add remaining marshmallows. Stir in the reserved 1 cup of marshmallows. They should melt only partially, leaving visible soft pockets throughout the finished bars for extra chew.
Fold in the cereal. Add the Rice Krispies all at once and fold gently with a buttered spatula until just combined. Do not overmix — you want to keep as much air and crunch as possible.
Press and cool. Turn the mixture into the prepared pan. Using lightly buttered hands or a piece of parchment, press the mixture into an even layer with a gentle touch — pressing too hard compacts the bars and makes them dense. Let cool at room temperature for at least 30 minutes before cutting.
Cut and serve. Cut into 16 bars. Store uncovered or loosely wrapped at room temperature for up to 2 days; airtight storage makes them sticky.

Nutrition (per serving)

Browned Butter Rice Krispies Treats — Celebrating Second Place with the Maillard Reaction at Home