Preheat your oven to 400°F (200°C). Arrange thick-cut slices of bread on a baking sheet and brush one side with olive oil.

In a skillet, add olive oil and minced garlic over medium heat. Sauté for 30 to 60 seconds until fragrant.

Add fresh spinach and cook until wilted, about 2 to 3 minutes. Remove excess moisture with a sieve.

In a mixing bowl, whisk together eggs, then add the drained spinach, crumbled feta, red pepper flakes, salt, and black pepper. Mix until combined.

Spread the spinach and egg mixture evenly across the prepared bread slices.

Bake in the preheated oven for about 12 to 15 minutes until the egg is set and the bread is golden brown.

Allow to cool for 1 to 2 minutes before serving warm, optionally with mixed greens or avocado.