Turn the heat down to medium, and add the other Tablespoon of butter to the Dutch oven. Once the butter has melted, add the onions and green pepper. Saute for about 4 minutes, or until the onions are starting to turn translucent. Add in the garlic, thyme, sea salt, onion powder, and black pepper. Saute for 1 more minute, or until the garlic is aromatic.