01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Spread eggplant cubes, red bell pepper, and red onion on the prepared baking sheet. Drizzle with 1 tablespoon olive oil and season with salt and pepper. Toss to coat evenly.
03 - Roast vegetables for 25-30 minutes, stirring halfway through, until eggplant is browned and tender.
04 - Combine lentils, water, and bay leaf in a medium saucepan. Bring to a boil, then reduce heat and simmer uncovered for 20-25 minutes until lentils are tender. Drain and discard bay leaf.
05 - In a small bowl, whisk together remaining 2 tablespoons olive oil, lemon juice, minced garlic, oregano, and additional salt and pepper to taste.
06 - In a large bowl, combine cooked lentils, roasted vegetables, cherry tomatoes, and spinach. Pour dressing over and toss gently to coat.
07 - Divide mixture among bowls. Top each with feta cheese, olives, and chopped parsley. Serve warm or at room temperature.