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In a medium sized bowl, gently mix diced tomatoes (add a pinch of salt), feta cheese and sliced olives. Add Koroneiki olive oil and vinegar and let sit to marinate.
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Lightly brush baguette slices with Koroneiki olive oil and place in large skillet or grill pan at medium heat for 2-3 minutes per side, or until nice and toasty.
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Line each baguette slice with a two leaves of spring mix lettuce. Pile desired amount of marinated tomato mixture on top, and lightly drizzle with Koroneiki olive oil. Serve immediately.