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Much depends on the context. Here are some possibilities:
1. I'd like cornflakes for breakfast, with milk.
2. I'd like milk with my cornflakes, please.
3. Could you pour some milk on my cornflakes, please?
4. I'm eating cornflakes with milk and sugar.
"I'm having milk with/and cornflakes" sounds slightly odd; milk is the accompaniment to cornflakes, so naturally follows it.
breakfast question 
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