Heat the olive oil in a large skillet over medium heat until it shimmers.
Add diced onion and minced garlic to the skillet, sautéing until they become translucent and fragrant.
Introduce the ground turkey to the pan, breaking it apart with a spatula as it cooks until browned and fully cooked.
Incorporate halved Brussels sprouts along with salt, black pepper, and optional red pepper flakes, stirring to coat evenly.
Pour in chicken broth and cover the skillet, allowing it to simmer for about 5-7 minutes or until the Brussels sprouts are tender.
Remove from heat and stir in fresh lemon juice before serving warm.