Cook the pasta according to the package directions and drain it.
3 cups pasta
In a dutch oven, melt the butter over medium heat. Once the butter is melted, whisk in the flour and continue to whisk until it begins to brown. This should take about a minute and a half.
2 tbsp butter, 2 tbsp flour
Slowly pour in the chicken broth and milk while still whisking. Simmer your sauce while whisking until it begins to thicken, 3-5 minutes.
14 oz chicken broth, 2 oz milk
Add the garlic powder, onion, salt and pepper.
½ tsp garlic powder, 1 tbsp dehydrated onion, ½ tsp salt, ¼ tsp pepper
Remove the pot from the heat. Stir in the shredded cheese until completely melted and then fold in the pasta.
1½ cups shredded cheddar cheese
Sprinkle the breadcrumbs and parmesan cheese on top and spray with cooking spray. Transfer it to the oven under the broiler to toast the topping (this should only take about 90 seconds so don’t walk away!)
½ cup bread crumbs, 2 tbsp grated parmesan cheese, cooking spray
Notes
If you use a regular pot rather than a dutch oven, transfer the mac and cheese to an oven-safe casserole before topping it off with breadcrumbs and parmesan. Then top it, spray it and broil it.