Creamy Summer Squash Orzo with Steak Tips

Name: Creamy Summer Squash Orzo with Steak Tips
Ingredients: 4 tablespoons unsalted butter , divided; 2 summer squash , quartered lengthwise and sliced thin; 1 onion, chopped; 3 garlic cloves , sliced thin; 1¾ teaspoons table salt , divided; 1 teaspoon pepper , divided; 1½ cups orzo; 3 cups chicken broth; 1½ pounds sirloin steak tips , trimmed and cut into 2-inch chunks; 1 (5.2-ounce) package Boursin Garlic & Fine Herbs cheese , room temperature; 3 ounces (3 cups) baby spinach , chopped coarse