Add 1 tbsp. olive oil to a large pot and heat over medium-high heat.
Add sausage and 1/4 cup water. Bring to a simmer. Cover and cook until sausages are browned on the bottom.
Flip sausages and cook until browned on both sides and cooked through. Remove from pot and set aside.
Once the sausages are cool to the touch, slice into rounds.
Add 1 tbsp. olive oil to the same pot and heat over medium.
Add the garlic, mirepoix mix, zucchini, and red bell pepper. Cook until the veggies have softened.
Add sausage back to pot. Add 2 cups water, broth packet, and marinara. Season with salt and pepper and stir. Bring pot to a simmer, cover, and cook.
While the gumbo is simmering, heat the package of rice according to the instructions. Then, divide the rice between two bowls.
Spoon the gumbo over the bowls of rice and serve. If desired, garnish with fresh Italian herbs like oregano, rosemary, or basil.