Everything Cauliflower

Ingredients

• 4 tablespoons plus 1 teaspoon unsalted butter, divided
• 4 cloves garlic, thinly sliced
• 1 teaspoon kosher salt, divided
• 1/2 teaspoon ground pepper, divided
• 1/3 cup all-purpose flour
• 3 cups whole milk
• 2 large heads cauliflower, cored and cut into 2-inch-thick florets
• 1/4 cup chives, finely sliced, divided
• 1/2 teaspoon cayenne pepper
• 1 1/3 cups Parmigiano-Reggiano cheese, finely grated
• 3 tablespoons toasted sesame seeds
• 1 tablespoon poppy seeds
• 1 1/2 teaspoons caraway seeds