Preheat oven to 375°F.

In an ovenproof skillet over medium heat, add 3 tablespoons olive oil and the garlic and cook for 1-2 minutes, making sure not to burn the garlic. Add in 1/2 teaspoon red pepper flakes and the spinach. Sauté until the spinach has wilted. Transfer spinach to a plate and set aside.

Add the marinara to the skillet along with the whole tomatoes, chickpeas, kosher salt, and lemon zest and juice. Cook for 5 minutes until a simmer is reached. Remove from heat and set the pieces of feta cheese in the sauce.

Place skillet in preheated oven and cook until the cheese softens, 8-10 minutes. Remove from oven and tuck spinach into sauce.

Serve with additional crumbled feta, red pepper flakes, olive oil, and a nice crusty piece of bread.