Start by bringing a large pot of salted water to a boil. Add the dry elbow macaroni and cook according to package instructions until al dente. Drain and set aside.
In a blender or food processor, combine the avocados, garlic, lime juice, cilantro, and a pinch of salt and pepper. Blend until smooth and creamy. Set aside.
In the same large pot, melt the butter over medium heat. Once melted, whisk in the flour and cook for about 1 minute, stirring constantly to form a roux. Gradually pour in the milk, whisking continuously until the mixture thickens and is smooth.
Lower the heat and add the shredded Pepper Jack cheese to the milk mixture. Stir until the cheese is completely melted and the sauce is creamy. Season with additional salt and pepper to taste.
Add the drained macaroni to the cheese sauce and stir to combine. Then fold in the avocado mixture until everything is well coated.
Serve the Stovetop Avocado Mac and Cheese warm, garnished with fresh avocado chunks and extra cilantro, if desired. Enjoy your creamy, dreamy dish!