You work at a restaurant. There’s a dish with corn and brussel sprouts. I ask you to substitute corn for potatoes. How do you substitute the dish?

I ask because I did this at a restaurant using this exact language and they didn’t substitute the item I wanted. My mom said, because of my language, they thought I meant the opposite, so I’m curious to see what y’all think.
Keep the brussel sprouts, change corn for potatoes
Keep the corn, change brussel sprouts for potatoes
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You work at a restaurant. There’s a dish with corn and brussel sprouts. I ask you to substitute corn for potatoes. How do you substitute the dish?
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