Caramelized Onion Cheese Pizza

1 tablespoon olive oil 8 cups sliced yellow onions (about 2 lbs) 5 cups sliced shiitake mushroom caps (about 10 oz whole mushrooms) 4 garlic cloves , minced 2[...]

2 cups plain flour 2 teaspoons baking powder 1/2 teaspoon kosher salt 3/4 cup whole milk 1/4 cup olive oil 2 tablespoons unsalted butter , melted 1 Preheat[...]