### Step 1: Prepare the Spinach Mixture
Heat a skillet over medium heat and add **olive oil**.
Add **minced garlic** and sauté for about **30 seconds** until fragrant.
Toss in **chopped spinach** and stir for **1-2 minutes** until wilted.
Remove from heat and let it cool slightly.
### Step 2: Assemble the Quesadilla
Place one tortilla on a flat surface.
Evenly spread the **sautéed spinach** over half of the tortilla.
Sprinkle **crumbled feta cheese** and **shredded mozzarella** on top.
Season with **black pepper** and **red pepper flakes** if desired.
Fold the tortilla in half to cover the filling.
### Step 3: Cook the Quesadilla
Melt **butter** in a skillet over medium-low heat.
Place the folded tortilla into the pan.
Cook for about **2-3 minutes per side**, pressing lightly with a spatula to ensure even browning.
Once golden brown and crispy, remove from the pan.
Step 4: Serve & Enjoy
Let the quesadilla rest for **1 minute**, then slice into wedges.
Serve warm with a side of **Greek yogurt, sour cream, or salsa**.