Smoky Greens Soufflé

Name: Smoky Greens Soufflé
Ingredients: 1 (15-oz.) pkg. frozen chopped collard greens, thawed Unsalted butter, for greasing soufflé dish; Unsalted butter, for greasing soufflé dish; 3 Tbsp. grated pecorino Romano cheese; 4 thick-cut hickory-smoked bacon slices, chopped (1 cup packed); 3 Tbsp. all-purpose flour; 1 cup whole milk; 0.75 cup fontina cheese, shredded; 4 large egg yolks; 1.25 tsp. Creole seasoning; 1 tsp. hot sauce, plus more for serving; 0.5 tsp. grated garlic (from 1 clove); 7 large egg whites; 0.5 tsp. cream of tartar