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1
Pour chicken broth into a small bowl and sprinkle gelatin over the top. Let sit at least 5 minutes to soften. Place bread in a large bowl and moisten with milk. Stir in cheese, egg, parsley, half of the basil, 1 teaspoon salt, 1 tablespoon oil, 1 clove garlic, and 1/4 teaspoon red pepper flakes until combined.
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2
Heat gelatin mixture in microwave or in a small saucepan until melted and stir into bread mixture. Add chicken and gently mix with hands until just combined. Chill 10 minutes and then, using wet hands or a 1/4-cup ice cream scoop, form into 12 balls.
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3
Heat remaining 3 tablespoons oil in large saucepan over medium heat until shimmering. Add onion and 1 teaspoon salt, and cook, stirring occasionally, until softened, about 8 minutes. Add garlic cook until fragrant, about 30 seconds. Add remaining 1/4 teaspoon red pepper flakes, 1/4 teaspoon ground black pepper, and tomatoes (with juice). Bring to simmer and cook 10 minutes to let flavors meld. Season to taste.
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4
Carefully nestle meatballs into the sauce and cover. Simmer until meatballs are just cooked through (160u00b0F), about 10 minutes. Sprinkle in remaining chopped basil. Keep warm.
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5
Heat 3 quarts of salted water in stock pot over high heat. Add pasta. Cook, stirring occasionally, until pasta is al dente (usually about 1 minute less than recommended cooking time on box). Reserve 1 cup pasta water and drain pasta. Return pasta to pot and toss with 1 cup sauce, adding pasta water if necessary to loosen. Serve, topping with meatballs, more sauce, and Parmesan cheese.
