Combine all ingredients except butter and ranch dressing mix in a large bowl.

In a small microwave-safe bowl (I like these Pyrex measuring cups), melt the butter in the microwave.

Stir the ranch dressing mix into the butter.

Pour the butter mixture over the cracker mixture. Using a soft spatula, toss to coat all the crackers with butter.

Transfer the cracker mixture into a microwave-safe bowl. Microwave on high for 1 minute. Stir.

Microwave cracker mixture on high for 1 more minute; stir. Repeat one more time. (You should have microwaved the cracker mixture for a total of 3 minutes, stirring after every minute.)

Spread cracker mixture out on paper towels to dry.

Store in an air-tight container.