Heat olive oil in a large skillet over medium-high heat.
Add the diced onion and sauté for 4 minutes until translucent.
Add the ground turkey to the skillet and cook until fully browned, breaking the meat into small crumbles with a spatula.
Stir in the minced garlic, smoked paprika, salt, and black pepper, cooking for 1 minute until fragrant.
Incorporate the sliced Brussels sprouts into the skillet, stirring to combine with the turkey and aromatics.
Cook for 7 to 9 minutes, stirring occasionally, until the Brussels sprouts are tender and develop golden-brown edges.
Pour in the soy sauce and red pepper flakes, stirring for 1 minute to deglaze the pan and coat the ingredients.
Remove from heat and serve hot.