Portobello Spinach Eggs Benedict

Name: Portobello Spinach Eggs Benedict
Ingredients: 4 portobello mushroom caps (3 1/2- to 4-inch), stems and gills removed; 2 tablespoons olive oil, divided; 1 1/4 teaspoons salt , divided; 1/4 teaspoon ground black pepper; 2 tablespoons plain fat-free Greek yogurt; 4 teaspoons light mayonnaise; 2 teaspoons snipped fresh thyme; 1 teaspoon Dijon mustard; 1 teaspoon lemon juice; 1/4 teaspoon bottled hot pepper sauce, or more to taste; 4 cloves garlic, minced; 4 cups fresh baby spinach, chopped; 1/2 teaspoon salt-free Cajun seasoning; 1 teaspoon white vinegar; 4 eggs