White Bean, Tomato, and Spinach Gratin
![](https://delishclub.com/wp-content/uploads/2016/01/White-Bean-Tomato-and-Spinach-Gratin.jpg)
![](https://delishclub.com/wp-content/uploads/2016/01/White-Bean-Tomato-and-Spinach-Gratin.jpg)
A layer of crunchy breadcrumbs tops this vegetarian casserole. Rosemary and dry white wine add fabulous flavor. Ingredients 2 spray(s) cooking spray   2 tsp olive oil, extra virgin    2 large uncooked onion(s), thinly sliced   2 tsp kosher salt, divided   2 tsp minced garlic   1/4 cup(s) white wine, dry   […]