Turkey Sausage Breakfast Sandwich

Ingredients

• 1 teaspoon whole fennel seed
• 1 teaspoon dried rubbed sage
• 3/4 teaspoon salt
• 3/4 teaspoon freshly ground black pepper
• 1/2 teaspoon dried thyme
• 1/4 teaspoon granulated garlic (garlic powder)
• 1/8 teaspoon ground allspice
• 1 pound ground dark-meat turkey (93 percent lean)
• 1 tablespoon olive oil
• 8 whole-wheat English muffins (not honey wheat)
• 2 cups lightly packed fresh spinach leaves
• 2 medium tomatoes, sliced
• Flesh of 2 ripe avocados, sliced
• Hot sauce and/or ketchup (optional)