Sausage Shiitake Strata — Cafe Hailee

Name: Sausage Shiitake Strata — Cafe Hailee
Prep time: 25 min
Cook time: 1 h
Total time: 1 h 25 min
Ingredients: Butter, for greasing; 1 Tbsp olive oil; 8 oz breakfast sausage; 8 oz shiitakes, stemmed and sliced; 1 bunch scallions, thinly sliced, green and white separated; 5 oz baby spinach; 7 eggs; 1 1/2 cups whole milk; 1/2 cup heavy cream; 5 oz fontina cheese, shredded; 1 tsp kosher salt; 1/4 tsp black pepper; 8 oz sourdough bread, torn into about 1 inch pieces