Heat the olive oil in a large skillet over medium-low heat. When the oil is hot, add the onion and cook until softened and just starting to brown, about 7 to 10 minutes.
1 tablespoon olive oil, 1 medium onion
Add the garlic and cook for another minute.
2 to 4 cloves garlic
Stir in the ground chicken, breaking it up with a spatula, and cook until no longer pink.
1 pound ground chicken
Add the white wine, bring it to a boil, and then reduce the heat until it's barely simmering. Scrape up any bits that have stuck to the bottom of the pan and cook until the pan is nearly dry.
¼ cup white wine or vermouth
Add the cinnamon, oregano, red pepper flakes, nutmeg, and tomato paste and stir them in. Add the tomatoes, crushing them carefully with your hand in the can before dropping them into the pan.
1 teaspoon ground cinnamon, 1 teaspoon dried oregano, ½ teaspoon red pepper flakes, ⅙ teaspoon ground nutmeg, 1 tablespoon tomato paste, 1 28 ounce can whole tomatoes
Season with salt and pepper, and simmer for 20 to 30 minutes, uncovered, stirring occasionally, until the sauce thickens.
½ teaspoon kosher salt, ½ teaspoon black pepper