Greek Yogurt Egg Salad Sandwich
1 pinch garlic powder, or to taste 1 tablespoon chopped fresh chives, or to tast… 1 tablespoon mustard, or to taste 1 teaspoon chopped fresh dill, or to taste 2 large eggs 2 slices whole grain bread, toasted 2 tablespoons plain low-fat Greek yogurt 2 teaspoons lemon juice 3 cherry tomatoes, diced sea salt and ground black pepper to taste ¼ cup baby spinach, or to taste