Tzatziki Salmon-Couscous Bowls

Ingredients

• 1 1/2 cups whole wheat Israeli (pearl) couscous
• 2 Tbsp plus 1 tsp olive oil, divided
• 2 tsp Greek seasoning, divided
• 6 (4-oz) salmon fillets
• 1 (5-oz) pkg baby spinach
• 1 English cucumber, sliced
• 1 pint cherry tomatoes, halved (preferably multicolored)
• 2 avocados, diced
• 1 cup thinly sliced red onion
• 1 1/2 cups tzatziki dip