Favorite Cheese and Potato Souffle

Name: Favorite Cheese and Potato Souffle
Ingredients: 1 1/2 tablespoons plus 2 tablespoons softened butter (divided); 1 cup bread crumbs; ¼ cup finely minced shallots; 3 cloves garlic (minced); 1 teaspoons crushed red chilies (optional); 2 tablespoons all-purpose flour; 1.5 cups diced Yukon Gold potatoes (peeled and cooked); 1 cup whole milk; ¾ cup shredded cheddar cheese; ¼ cup grated Parmesan cheese; ¼ cup camembert of other soft cheese; 2 tablespoons chopped chives; 3 eggs (separated); Kosher salt and lots of freshly cracked pepper