Preheat broiler. Heat 2 tablespoons oil in a 12-inch cast-iron skillet over medium-high heat.
Add chopped onion and chopped bell pepper; cook, stirring occasionally, until the vegetables begin to soften, about 4 minutes.
Add tofu pieces; cook, stirring often, until the tofu is lightly browned and crispy in spots, 8 to 10 minutes.
Add chopped garlic; cook and stir until fragrant, about 1 minute.
Remove from heat. Stir in 1 jar enchilada sauce and the rinsed black beans.
Fold in tortilla wedges until evenly combined. Top with 1 cup cheese.
Broil until the cheese is melted, about 3 minutes.
Top with sliced radishes, chopped cilantro and sliced jalapeño. Dollop with ¼ cup sour cream.
