Ingredients:

• 1 1/2 pounds multi-colored cherry tomatoes (about 4 cups), halved, divided
• 1/2 teaspoon kosher salt
• 1 (8-ounce) package cream cheese, softened
• 1/2 cup mayonnaise
• 1/4 teaspoon onion powder
• 1/4 teaspoon ground black pepper, plus more for garnish
• 6 ounces sharp cheddar cheese, shredded, divided (about 1 1/2 cups)
• 1 tablespoon chopped Calabrian or pimento peppers
• 1/2 teaspoon dried basil
• 1 (10-ounce) baguette
• 4 tablespoons salted butter, melted
• Thinly sliced green onions, for garnish