Smoked Salmon Egg Salad Sandwiches

Ingredients (12)

• 8 hardboiled eggs, peeled *see note
• 3 Tablespoons whole milk Greek yogurt
• 2 Tablespoons mayonnaise
• 1 Tablespoon small capers (if you buy the big ones, you'll want to chop them up first)
• 2-3 teaspoons grainy mustard
• 2 Tablespoons chopped fresh chives
• Salt and pepper to taste
• Dark rye bread slices
• Thinly sliced red onion
• Arugula
• Sliced tomatoes
• 8 ounces smoked salmon