No-Noodle Sweet Potato “Lasagna”

Ingredients

• 1 sweet potato sliced into very thin round slices
• 1 red onion medium, sliced into thin, round slices
• 2 zucchini large, trimmed, sliced lengthwise in 1/4-in thick slices
• 1 bunch kale thick stems removed
• 1 1/3 cups broccoli florets
• 1 large egg beaten
• 2 cups ricotta cheese skim or whole milk
• crushed red pepper flakes to taste
• 1/4 cup fresh basil torn
• 1/2 cup parmigiano-reggiano grated
• 4 cloves garlic minced
• 4 cups marinara sauce good quality, divided
• 1 1/2 cups mozzarella cheese shredded, divided, you can use part skim if you’d like to keep the fat down
• salt and ground black pepper
• olive oil spray