Step 1

Preheat oven to 425℉. Place pepper halves, cut side up, in a small roasting pan or glass baking dish.

Step 2

Heat oil in a large skillet over medium heat. Add onion; saute until translucent, about 5 minutes. Add tomatoes and mushrooms; saute until tender, mashing tomatoes with a wooden spoon about 5 minutes. Add spinach; cook, stirring a few times, until wilted, 2 to 3 minutes. Add garlic; cook, stirring, until fragrant. 30 seconds to 1 minute. Remove from heat; stir in salt, black pepper, and red pepper flakes.

Step 3

In a large bowl, combine ricotta, 6 tbsp Parmesan, egg, and Italian seasoning. Add onion mixture; stir to combine.

Step 4

Evenly divide ricotta mixture (about ½ cup each) between pepper halves; sprinkle each with ½ tbsp remaining Parmesan. Bake until peppers are tender and lightly browned, 25 to 30 minutes. Garnish parsley or basil; serve.

Step 5

Serving size: 1 pepper half