Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper if desired.
In a pan over medium heat, add the olive oil and minced garlic. Sauté for about 1 minute until fragrant.
Add the chopped spinach to the pan, cooking until wilted, approximately 2-3 minutes. Season with salt, pepper, and dried oregano. Remove from heat.
Spread the ricotta cheese evenly over the flatbread, leaving a small border around the edges.
Distribute the sautéed spinach mixture on top of the ricotta layer.
Sprinkle the shredded mozzarella cheese and crumbled feta cheese evenly over the spinach.
Place the flatbread on the prepared baking sheet and bake in the preheated oven for 10-12 minutes or until the cheese is melted and bubbly, and the edges are golden brown.
Remove from the oven and let cool for a couple of minutes before slicing. Garnish with fresh basil leaves if using.