Pat your vegetables completely dry with paper towels—moisture prevents those beautiful char marks from forming. This critical step takes one minute but makes all the difference in achieving grill pan veggies with authentic caramelization and crispy edges.
Heat a cast iron grill pan over medium-high heat for 3-4 minutes until it's smoking slightly. The pan should be hot enough that water droplets sizzle immediately upon contact with the surface.
While the grill pan heats, combine garlic, Italian herbs, salt, black pepper, and smoked paprika in a small bowl. Drizzle olive oil over your cut vegetables and sprinkle with this seasoning mixture, tossing gently to coat everything evenly.
Working in batches to avoid overcrowding, place vegetables on the grill pan in a single layer. Let each piece sit undisturbed for 3-4 minutes until deep char marks appear before flipping to cook the other side.
After flipping, cook for another 2-3 minutes until vegetables are tender inside but still slightly firm. Remove to a serving platter as they finish cooking through.
Once all vegetables are cooked, drizzle with balsamic vinegar and scatter fresh basil on top. Taste and adjust seasonings as needed, adding more salt or herbs to your preference before serving immediately while still warm.