In a 13-inch pan, saute over medium-high heat the bacon and olive oil. When oil heats and bacon begins to sizzle, add the sweet potatoes and spread out as much as possible to allow potatoes to rest in pan in a single layer. Leave potatoes to cook until a quick toss reveals browning, about 5 minutes. Continue to toss and stand until most sides of potatoes are golden and bacon is crisp, 3-5 minutes longer. Add onions, garlic, jalapenos, cumin and season with salt and pepper. Cook the same way allowing everything to sit in the heat of the pan for a minute or two. Taste and re-season if needed.