Swap Your Traditional Casserole for This Keto Cheesy Brussels Sprouts Recipe

Name: Swap Your Traditional Casserole for This Keto Cheesy Brussels Sprouts Recipe
Cuisine: European, American
Ingredients: 3-4 tablespoons extra virgin olive oil; 2 pounds Brussels sprouts, halved or quartered depending on size; 1/2 teaspoon kosher salt; 4-6 ounces bacon, cut into lardon size (1/4-inch pieces); 1 cup diced onion; 1 1/2 to 2 cups heavy cream; 1/2 cup sour cream; 8 ounces grated smoked gouda cheese; 8 ounces grated low-moisture, part-skim mozzarella cheese; 4 ounces crumbled feta cheese, for garnish; 1 teaspoon garlic salt; freshly ground black pepper