Finely chop the bacon, then transfer to a medium bowl. Stir in 8 ounces room-temperature cream cheese, 4 ounces shredded sharp cheddar cheese, 2 tablespoons minced fresh chives, the finely grated zest of 1 medium lemon, 2 teaspoons lemon juice, 1/4 teaspoon garlic powder, 1/4 teaspoon kosher salt, and 1/4 teaspoon black pepper until combined.