Preheat oven to 350°F (175°C). Prepare macaroni according to package directions; drain.
Melt 4 tbsp (60 mL) of the butter in a saucepan. Sprinkle with the flour and 1 tsp (5 mL) of the seasoning; whisk until combined. Gradually add the milk, stirring constantly until smooth. Cook over medium heat for 5–7 minutes, or until the mixture comes to a boil, then cook for 1 minute, stirring constantly. Reduce the heat and add the cheeses, stirring until melted.
Remove from heat. Combine the pasta and sauce in a greased 8" (20-cm) Brilliance Nonstick Square Pan.
Microwave the remaining 1 tbsp (15 mL) of butter in a small bowl until melted, 30 seconds. Mix in the cracker crumbs and remaining seasoning. Sprinkle the mixture over the top of the pasta. Bake, uncovered for 20-25 mins or until golden brown and bubbly.