Bring a medium pot of water to a boil. Add couscous and 2 teaspoons salt. Cook according to package instructions, drain, and rinse with cold water.
Meanwhile, in a small bowl, mix garlic, oil, lemon/lime juice, cumin and chili powder.
In a large bowl, combine couscous, bell pepper, scallions, beans, corn, tomatoes, cilantro, and jalapeños until combined. Add dressing and toss to coat; season with salt, if needed.
Make Ahead: Salad can be made 3 days ahead. Store in an airtight container and refrigerate.
