Lentil Stuffed Peppers

Name: Lentil Stuffed Peppers
Ingredients: 2 large bell peppers; 1/2 cup black Beluga lentils; 2 tablespoons olive oil (plus extra for drizzling); 1 leek (quartered, sliced and washed); 3 cloves garlic (minced); 2 medium yellow squash (finely diced); 1 cup grape tomatoes (halved); Kosher salt; Freshly ground black pepper; 1 teaspoon cumin; 1 teaspoon coriander; 1/2 teaspoon marjoram; 1/2 teaspoon paprika; 1/4 teaspoon balsamic vinegar; 1 cup crumbled/grated cheese (such as feta, Gorgonzola, mozzarella); Fresh parsley (chopped, for garnish)