Halve the avocados and scoop into a medium sized mixing bowl. Set pits aside.
Using a potato masher, mash avocados until most chunks are gone.
Add sour cream, tomatoes, onion, and the pepper, and stir.
Add juice from 1/2 a lime.
Add garlic powder and salt. Don't overdo it; add gradually until taste preference is achieved.
Add the pits to the guacamole mixture, stir well, garnish with green onion (optional) and serve with chips. The pits help the guacamole from turning brown.
*Optional Preparation* If you prefer, you can toss tomato and pepper in a food processor for a thinner consistency before adding to guacamole.
*You can add cilantro, if preferred.