How to Make It
Cook rice according to package directions. Preheat oven to 425°F.
Brush 1/2 teaspoon oil over cut sides of squashes; top with 1/2 teaspoon salt. Place squashes, cut sides down, on a parchment paper-lined baking sheet. Bake at 425°F for 20 minutes or until almost tender. Remove from oven.
Heat remaining 1/2 teaspoon oil in a large skillet over medium. Add sausage; cook 3 minutes, stirring to crumble. Add onion and celery; cook 5 minutes. Add mushrooms; cook 4 minutes. Add garlic and thyme; cook 1 minute. Add spinach, stirring until wilted. Remove pan from heat; stir in cooked rice, remaining 1/4 teaspoon salt, parsley, juice, and pepper.
Spoon about 1/2 cup rice mixture into each squash half. Bake at 425°F for 10 minutes or until squash halves are tender and lightly browned.