Finally, you can make gravy. In a medium-sized saucepan, over medium-high heat, add your broth, and bouillon cube. Stir until the cube is dissolved.
Add Worcestershire sauce, and continue heating the liquid.
Once you see it beginning to simmer, in a small bowl or cup, add cornstarch and water. Whisk until no lumps remain.
Gently pour the water and cornstarch mixture into your warm broth. Pour it slowly in a continual stream, while you whisk the broth mixture.
Please note that it is very important you pour this slowly and mix the entire time, to prevent clumps from forming.
Continue stirring over medium heat, while the mixture comes to a simmer. Keep it at a light simmer, while you stir continually. You will begin to see the gravy thicken slightly.
Once thick, remove the gravy from the burner, and add salt, pepper, garlic powder, onion powder, brown sugar, ketchup, and BBQ sauce. Stir the mixture to combine.