Heat the oil in a large pot on a medium high heat.
Once hot, add the chopped and sliced vegetables; onions, bell peppers, jalapenos and mushrooms.
Cook, stirring occasionally for 15 to 20 minutes til soft.
Once the vegetables are soften, stir in the garlic, chili powder, cayenne, salt and pepper, oregano and paprika. Cook for a couple of minutes til fragrant.
Add the beans, diced tomatoes, tomato paste, Worcestershire sauce and brown sugar and stir to combine.
Bring the pot to a boil and simmer for 20 minutes.
Notes
Use a heavy bottomed pot or Dutch oven to make this recipe. It will disperse heat more evenly so the bottom will be less likely to scorch.
Use the largest pot you have as this makes a big batch.
Drain and rinse the beans well before adding to the pot.
If making ahead of time, let the mushroom chili cool completely before storing.