Oh God... I told her I can cook... What simple yet impressive recipes do you use to impress someone?

So I work in a small kitchen. I make great pizzas with fresh dough, sauce and ingredients. But the kitchen serves other things like pastas and sandwiches. But that's about it. But after buying new knives, working in this kitchen, and telling her I made something more difficult than mac and cheese (spinnach and provolone stuffed chicken breast) she thinks I could cook well.

So I have about 2 1/2 weeks before I go visit this person. She wants me to cook for her. I have that time to learn how to make a good dish and plate it well. Can you folks help me out here? Maybe a recipe with a picture of nice plating? Any help is appreciated. Thank you.