PREHEAT OVEN TO 350°F AND GREASE A 9×13-INCH BAKING DISH WITH NONSTICK SPRAY.
IN A LARGE POT OF BOILING SALTED WATER, COOK THE PASTA ACCORDING TO PACKAGE DIRECTIONS. DRAIN AND SET ASIDE.
IN A LARGE POT OVER LOW HEAT, COMBINE THE ROTEL, CREAM OF CHICKEN SOUPS, VELVEETA, AND CREAM CHEESE. COOK, STIRRING CONSTANTLY, UNTIL CHEESE HAS MELTED.
ADD CHICKEN, SPAGHETTI, AND GARLIC POWDER AND STIR TO COMBINE. SEASON TO TASTE WITH SALT AND PEPPER.
POUR MIXTURE INTO PREPARED BAKING DISH AND TOP WITH CHEDDAR CHEESE. BAKE UNTIL BUBBLY, 20-25 MINUTES. ENJOY!