In the same skillet, reduce the heat to medium-low and melt the butter. Add the garlic, red pepper flakes, and cassava flour. Stir, toasting the flour, for 1 minute.
While whisking, pour the wine into skillet to combine. Add the chicken broth, whisking constantly, until well combined. Add the capers, parsley, lemon juice, salt, and pepper. Stir to combine, then increase heat to a rapid simmer.
Reduce the heat to a light simmer then nestle the meatballs back into the sauce. Cover and cook until the meatballs are cooked through, 5 to 7 minutes.
Garnish with additional parsley, serve, and enjoy!