Place peas in a medium bowl and mash thoroughly with a potato masher or fork. (Or puree peas in a small blender or food processor and transfer to a medium bowl.) Add avocado, yogurt, lime juice, garlic, 1/4 teaspoon salt, 1/8 black pepper, cumin, and chile powder. Continue to mash until blended.
Stir in tomatoes, onion, and some cilantro and/or jalapenos, if using. Season with additional salt and pepper, if desired. Enjoy!