Step 1: Cook the elbow macaroni according to package instructions until al dente. Drain and set aside in a large mixing bowl.
Step 2: In a saucepan over medium heat, combine the whole milk and olive oil. Whisk in the mayonnaise until smooth and fully incorporated, then bring the mixture to a gentle simmer. Stir in the shredded cheddar cheese gradually, allowing it to melt and create a creamy cheese sauce.
Step 3: Once the cheese is melted and the sauce is smooth, add the salt and black pepper. Stir well to ensure the seasoning is evenly distributed throughout the sauce.
Step 4: Fold the cooked macaroni into the cheese sauce, making sure every piece is coated with that luscious, creamy goodness.
Step 5: Gently mix in the chopped celery, green bell pepper, and jarred pimientos. These vibrant ingredients will not only add flavor but also a beautiful crunch to the dish.
Step 6: Transfer the mac and cheese mixture into a greased baking dish. If you like a crispy top, you can sprinkle some additional shredded cheese or breadcrumbs on top.
Step 7: Bake in a preheated oven at 350°F (175°C) for about 20-25 minutes, or until the top is golden brown and the edges are bubbling. This step is crucial for that perfect texture.
Step 8: Remove from the oven and let it sit for a few minutes before serving. This gives the dish time to set, making it easier to serve.
Step 9: Serve hot, garnished with extra chopped green onions for a pop of color and additional flavor. Enjoy your creamy mac and cheese with a Southern twist!