Slow Cooker Ratatouille - Jaime Shrayber

Ingredients

• 4 tablespoons olive oil (divided, plus more for drizzling)
• 2 medium yellow onions (diced)
• 1 pound eggplant
• 1 pound zucchini or summer squash
• 2 large red (green, or yellow bell peppers (about 1 pound))
• 1 pound tomatoes (I sub a can of diced tomatoes (it may need 2 cans))
• 4 cloves garlic
• 2 tablespoons tomato paste
• 1/2 teaspoon fine salt (plus more for seasoning)
• 1/4 cup coarsely chopped fresh basil leaves
• turkey sausage (optional if you want more protein)