In a large pot with a wide base, heat the olive oil over medium-high heat. Add the fresh mushrooms first, followed by the dried ones, if using.
Once the mushrooms have caramelized and the water has evaporated, add the shallots, garlic, carrots, and bell pepper. Mix over the heat for 2 minutes.
Add the balsamic vinegar, salt and pepper, and taste to see if you want more salt.
Add the marinara sauce and simmer for ten minutes before serving over your favorite pasta noodles.
For the one pot meal variation, add 1.5 cups of water to the marinara sauce and bring to a boil. Add an extra tablespoon of olive oil and one pound of pasta and allow to simmer for 6-8 minutes, stirring every 2 minutes so that the pasta doesn't stick.