In a bowl, mix flour, salt, water, and olive oil to form a soft dough. Let rest for 20 minutes.
Sauté spinach with olive oil and garlic until wilted. Let cool slightly, then mix with feta and black pepper.
Divide dough into portions and roll into thin circles.
Add filling to the center, fold, and seal into flatbread shapes.
Cook in a hot pan until golden, crisp, and fully cooked on both sides.
Melt butter and mix with honey, garlic, and chili flakes.
Brush garlic honey butter over hot flatbread.
Garnish with parsley and extra chili flakes.