Orzo with Caramelized Mushrooms and Wilted Spinach

Ingredients (10)

• + 1 cup uncooked orzo pasta add to pantry
• + 4 tablespoons unsalted butter, divided add to pantry
• ✓ 4 tablespoons extra-virgin olive oil, divided
• ✓ 2 cloves garlic, minced, divided, or more to taste
• + 1 ½ cups sliced button mushrooms add to pantry
• + 1 cup coarsely chopped fresh baby spinach, or more to taste add to pantry
• + ½ cup minced green onions, or to taste add to pantry
• + ½ cup shredded Parmigiano-Reggiano cheese, or more to taste add to pantry
• + salt and ground black pepper to taste add to pantry
• ✓ salt and ground black pepper to taste