Step 1

Melt butter in a skillet over medium heat; stir in onion and bell pepper. Cook and stir until the onion has softened and turned translucent, about 5 minutes.

Step 2

Combine condensed soup, milk, and ranch dressing mix in a slow cooker; whisk until combined. Stir in processed cheese food. Mix in broccoli, celery, carrots, and onion-bell pepper mixture.

Step 3

Cover and cook on Low, stirring occasionally, until cheese is melted, 3 to 4 hours.