Preheat oven to 350 degrees Fahrenheit

Fill a large pot with water and bring to a boil and then add in penne rigate and cook approximately 7-10 minutes

Cook and drain frozen vegetables according to package directions

Place frozen shrimp in a colander and rinse under cold water, removing any tail-shells

Add 2 tablespoons of butter to a saucepan and add in shrimp, saute shrimp to cook through approx. 3-5 minutes

Drain the penne rigate and place in a large lidded casserole dish, blend in the frozen vegetables

Add bouillon cube to a microwave safe vessel (I use my 2 cup glass measuring cup) and add in 1 cup of water, microwave for approximately 2 minutes, stopping to stir after the first minute

Add water and dissolved bouillon cube to the saucepan with the shrimp and bring to a rapid boil and then reduce heat to medium-low heat

Add grated cheddar cheese to the saucepan and stir

Add 1 heaping tablespoon of flour to a glass measuring cup and stir in 1 cup of milk to make a slurry and then add to the saucepan and stir to combine

Add in garlic powder and black pepper

Pour mixture from the saucepan on top of the penne rigate in the casserole dish and stir to combine

Sprinkle 1 cup of grated Parmesan cheese over the casserole

Cook in oven for 20-30 minutes and then serve