Heat the oil in a skillet over medium heat. Add the garlic, beans and chili paste and heat until fragrant, about 3 minutes. Using a potato masher or fork, mash the beans. Remove from the heat, add 2 tablespoons water and mash until somewhat smooth. Spread in a 2-quart glass casserole dish.
Scatter the cheese over the beans. Halve and pit the avocados; scoop out the flesh into a bowl and mash with 1 teaspoon salt and the lemon juice. Spread the avocado over the cheese.
Reserve some scallions, cilantro and jalapeno for garnish. Pulse the yogurt with the remaining scallions, cilantro and jalapeno in a blender or food processor. Spread over the avocado. Top with the lettuce. Season the tomatoes with another teaspoon salt and scatter over the lettuce. Top with the reserved scallions, cilantro and jalapeno.