Turkey Meatballs

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2 tablespoons olive oil

1 onion, finely chopped

1 rib celery, finely chopped

1/2 small red bell pepper, seeded and finely chopped

2 cloves garlic, finely chopped

1 pound ground turkey

1/2 cup quick-cooking (not instant) oats

1/2 cup grated Parmesan, plus more for serving

1 teaspoon Worcestershire sauce

One 10-ounce package frozen chopped spinach, thawed and excess moisture squeezed-out

Kosher salt and freshly ground black pepper

4 cups prepared marinara sauce

Warm cooked spaghetti, for serving