Caramelized Onion & Spinach Olive Oil Quick Bread

3 tsp olive oil, divided

1 large yellow onion, thinly sliced

1/2 tsp salt

2 cups (packed) fresh spinach leaves

2 garlic cloves, minced

2 1/2 cups all purpose flour

2 tsp baking powder

2 eggs, lightly beaten

3/4 cup milk

2/3 cup extra virgin olive oil

1 oz crumbled guyere cheese (or feta)

Butter and flour for pan

Heat 2 tsp olive oil in skillet over medium heat. Add the onion to the pan. Season with 1/2 tsp of salt. Cook for 10 minutes, reduce the heat to medium low and cook until the onions are golden brown. 

Add 1 tsp olive oil to the onions, stir in garlic and spinach leaves. Stir until the spinach is wilted and bright green, about 1 minute.  Remove from heat.

In a large bowl, whisk together flour, baking powder and 1/2 tsp salt. In small bowl combine eggs, lightly beaten, milk and extra virgin olive oil. Whisk well until combined. 

Pour egg mixture into flour and stir until just combined. Do not over mix or the bread will become tough. Add the spinach mixture and cheese, stir until combined. 

Butter a loaf pan. Spoon 1 tbsp flour into the pan and tap the flour around the pan. Shake out excess flour. Scoop the batter into the pan and smooth the top.

Bake until the top is light golden brown and a wooden toothpick inserted in center comes out dry, about 40 minutes. Remove bread from pan and cool. Slice and serve.