Mac and Cheese with Garlicky Breadcrumbs

INGREDIENTS

slices white sandwich bread, torn into pieces

6 cloves

garlic, minced or pressed

4 tbsp

unsalted butter

1/2 tsp

kosher salt

1/4 tsp

freshly ground black pepper

3 tbsp

freshly grated Parmesan cheese

1 lb

pasta shapes or shells

1 tsp

olive oil

8 tbsp

unsalted butter

5 tbsp

all-purpose flour

5 cups

whole milk

3 cups

grated cheddar cheese

3 cups

grated Gruyere cheese

2 1/2 cups

grated colby cheese

2 tsp

kosher salt

1/4 tsp

freshly ground black pepper

3/4 tsp

ground cayenne pepper, or more to taste