Heat oil in a 2-quart saucepan over medium heat. Whisk in flour until smooth. Cook, stirring occasionally, until lightly golden brown, 7 to 10 minutes. Add chicken broth 1 cup at a time, whisking well after each addition. Add bouillon, garlic powder, rosemary, black pepper, onion powder, and paprika. Whisk until smooth, about 3 to 5 minutes. Reduce heat to low; simmer until thickened, about 5 minutes.