Lori's Cauliflower au Gratin

Ingredients (12)

• + 1 large head cauliflower, cut into small florets and stems reserved add to pantry
• + 2 tablespoons grated Parmesan cheese add to pantry
• + 1 teaspoon dried chopped chives add to pantry
• + 2 tablespoons butter add to pantry
• + 1 tablespoon chopped shallot add to pantry
• + 1 tablespoon minced garlic add to pantry
• ✓ 1 cup vegetable broth
• + 1 cup heavy whipping cream add to pantry
• + 2 tablespoons prepared horseradish add to pantry
• + salt and ground black pepper to taste add to pantry
• + salt and ground black pepper to taste add to pantry
• + ½ cup shredded Gruyere cheese, or more to taste add to pantry