Preheat your oven to 400°F (200°C). Start by cutting the top off the medium head of garlic, drizzle it generously with olive oil, and wrap it tightly in aluminum foil. Place the wrapped garlic in the oven and roast for 30-35 minutes, until it's caramelized and fragrant, turning a golden brown.

While the garlic roasts, heat a tablespoon of olive oil in a skillet over medium heat. Add the chopped fresh spinach to the pan and sauté for 2-3 minutes or until wilted, stirring occasionally. Season with salt and pepper to taste.

Once the garlic is roasted and cool enough to handle, squeeze the cloves into a mixing bowl and mash them with a fork until smooth. Mix in the ricotta cheese, half of the shredded mozzarella, dried oregano, salt, and pepper, stirring until well-blended.

Place your pre-made pizza crust on a baking sheet. Spread the garlic-ricotta mixture evenly over the crust, then layer the sautéed spinach on top. Finish by sprinkling the remaining mozzarella, crumbled feta, and a dash of red pepper flakes.

Slide your assembled pizza into the preheated oven and bake for 15-20 minutes. Look for a golden, crispy crust and bubbly, lightly browned cheese.

Once baked to perfection, let the pizza cool for a few minutes. Garnish with fresh basil leaves and slice into wedges.