Easy Cheesy Zucchini Melts

Ingredients

• 4 tablespoons (1/2 stick) unsalted butter, at room temperature
• 4 ounces full-fat cream cheese, at room temperature
• 6 ounces sharp yellow cheddar cheese, shredded (about 1 1/2 cups)
• 2 tablespoons whole grain mustard
• 1 teaspoon kosher salt, divided
• 1/2 teaspoon freshly ground black pepper
• 1 medium zucchini (about 4 ounces)
• 8 slices marble rye bread

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