Preheat oven to 400°F (204°C). Cut bell peppers in half lengthwise, remove seeds and ribs. Set cut side up on parchment-lined baking sheet and brush with olive oil.
Bake peppers for about 20 minutes until they begin to soften. Drain water from peppers and reduce oven temperature to 350°F (176°C).
Microwave spinach for 15 to 30 seconds until wilted, then roughly chop.
In a large bowl, combine wilted spinach with ricotta cheese, shredded mozzarella, grated parmesan, sliced green onions, chopped basil, parsley, dried rosemary, thyme, fennel seed, salt, pepper, and eggs. Mix well.
Fill each pepper half evenly with the ricotta mixture.
In a small bowl, mix breadcrumbs with oil and sprinkle evenly over the stuffed peppers.
Return stuffed peppers to oven and bake for 30 minutes. If tops are not golden, broil for 1-2 minutes, watching closely until browned.
Serve warm and enjoy your delicious Tuscan Ricotta Stuffed Peppers.