Creamy Mac 'n' Cheese with Spinach

INGREDIENTS

4 cups

dried macaroni

4 tbsp

butter

1/4 cup

all-purpose flour

2 1/2 cups

1% milk

1 tsp

dry ground mustard

egg , lightly beaten

8 oz

extra sharp cheddar cheese , shredded, divided

5 oz

reduced-fat cream cheese

2 oz

Swiss cheese , shredded

1 oz

Parmesan cheese , grated

3 oz

fresh baby spinach , chopped

1/4 tsp

garlic powder

1/4 tsp

onion powder

1/2 tsp

ground white pepper

1/8 tsp

cayenne pepper

1/8 tsp

paprika

1/8 tsp

thyme