Smashed Egg Toasts with Herby Lemon Yogurt

Name: Smashed Egg Toasts with Herby Lemon Yogurt
Ingredients: 8 large eggs; 1 clove garlic; 1 medium lemon; 2 tablespoons finely chopped fresh basil leaves, plus more for garnish; 2 tablespoons finely chopped fresh dill, plus more for garnish; 2 tablespoons finely chopped fresh chives, plus more for garnish; 2 cups plain Greek yogurt; 2 tablespoons extra-virgin olive oil, plus more for drizzling; 3/4 teaspoon kosher salt, plus more for sprinkling; 1/2 teaspoon freshly ground black pepper, plus more for sprinkling; 4 large slices country or sourdough bread (about 1-inch thick); 4 tablespoons unsalted butter, divided