In a medium sauté pan heat the oil over medium high heat. Sauté the sausage for 3 minutes.
Add the garlic, cumin, and oregano and cook until fragrant, about 1 minute. Stir in the beans and cook until heated through, about 2 minutes. Season to taste with salt and pepper.
On a rimmed baking sheet layer the chips, sausage mixture, beans and cheese. Bake in middle of oven until cheese is melted, 6 to 10 minutes. Sprinkle the green onions and cilantro over the nachos and top with sour cream and salsa as desired. Serve warm.