Easy Crock Pot Mac and Cheese

• 1/4 tsp Garlic powder

• 1/2 tsp Mustard, ground

• 1 lb Macaroni pasta

• 1/2 tsp Black pepper

• 1/4 tsp Cayenne pepper

• 1 1/2 tsp Sea salt

• 4 tbsp Butter, salted

• 2 cups Cheddar cheese, sharp

• 4 oz Cream cheese

• 1/2 cup Heavy cream

• 1 cup Monterey jack cheese

• 3 cups Whole milk