Cut the top ΒΌ off of your loaf of bread and set it aside (save the top to make breadcrumbs).
In a large saute pan, heat oil, add garlic and saute 1 minute or until fragrant.
Add in the spinach and saute until wilted. Season with red pepper flakes, salt & pepper. Set aside and cover it with a lid.
Saute your mushrooms and peppers in a bit of melted butter. Season with salt & pepper. Saute until tender about 5-6 minutes (longer if your mushrooms are large).
Place your spinach atop the bread, nestle on the sauteed peppers and mushrooms.
Place it in the oven on a baking sheet for 4-5 minutes. Just until the bread gets warmed.
Sprinkle with Feta cheese, slice and serve.
Notes
For added flavor, smear your bread with butter and season with salt, pepper, red pepper and sauteed garlic or garlic powder.If you want your bread very crisp, heat it in the oven prior to topping it with the veggies. Feel free to add any vegetables or cheese you enjoy.