Take another look at the original sentence:

Mike has terrible eating habits when he opened his lunch bag, we saw a bag of potato chips, two candy bars, cellophane-wrapped cupcakes, and a carton of chocolate milk.

You chose to fix it the correct way:

Mike has terrible eating habits; when he opened his lunch bag, we saw a bag of potato chips, two candy bars, cellophane-wrapped cupcakes, and a carton of chocolate milk.

Mike has terrible eating habits is a complete sentence. When he opened his lunch bag, we saw ... begins the second complete sentence. You are always correct when you correctly use a semicolon between the two complete sentences that create the comma splice.

Go to the next sentence.

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