Heat 1 tablespoon olive oil in a medium pot over medium heat.
Add 1 cup diced carrots and 1/2 cup chopped scallions and sauté until softened, about 5–7 minutes.
Stir in 2 minced garlic cloves and cook for 1–2 minutes until fragrant.
Pour in 8 cups vegetable broth and bring to a boil, then reduce heat and simmer for 10 minutes.
Add 1 cup orzo and cook until tender, about 5 minutes, stirring occasionally to prevent sticking.
Stir in 8 ounces roughly chopped baby spinach and cook 2–3 minutes until wilted.
Season with 1/2 teaspoon sea salt and 1/4 teaspoon black pepper, adjusting to taste, then serve.