01 - Preheat your oven to 375°F (190°C).
02 - Cook the elbow macaroni in salted boiling water until al dente, following the package directions. Drain the pasta and set it aside.
03 - While the macaroni is cooking, slice off the tops of the orange bell peppers. Remove the seeds and internal membranes. If desired, use a small paring knife to carve jack-o'-lantern faces into each pepper.
04 - Melt the unsalted butter in a large saucepan over medium heat. Add the all-purpose flour and whisk continuously for 1 minute to create a roux.
05 - Gradually whisk in the whole milk, stirring constantly until the mixture is smooth and begins to thicken slightly, which should take approximately 3–4 minutes.
06 - Reduce the heat to low. Incorporate the shredded cheddar cheese, shredded mozzarella cheese, grated Parmesan cheese, smoked paprika, garlic powder, salt, black pepper, and turmeric. Stir until all the cheeses have melted and the sauce is smooth and homogenous.
07 - Add the cooked elbow macaroni to the cheese sauce. Mix thoroughly to ensure the pasta is evenly coated.
08 - Spoon the prepared macaroni and cheese mixture into the hollowed-out orange bell peppers. Arrange the filled peppers upright in a baking dish.
09 - Bake in the preheated oven for 20 minutes, or until the bell peppers are just tender and the tops of the macaroni and cheese are lightly golden.
10 - If desired, embellish the mac and cheese-filled peppers with sliced black olives to create "eyes" and "mouths." Serve the creations warm.