Peel and dice the sweet potatoes into 1/2-inch cubes.
In a large skillet, heat the olive oil over medium-high heat.
Add the sweet potatoes to the skillet and season with 0.25 tsp sea salt and 0.125 tsp black pepper.
Sauté the potatoes for 10-12 minutes, stirring occasionally, until they are tender and golden brown.
Remove the sweet potatoes from the skillet and set them aside on a plate.
In the same skillet, add the ground beef and cook until browned, breaking it into small crumbles with a spatula.
While the beef cooks, whisk together the maple syrup, apple cider vinegar, Dijon mustard, ground cinnamon, and the remaining salt and pepper in a small bowl.
Return the sweet potatoes to the skillet with the beef and pour the maple glaze over the mixture.
Toss everything together for 2-3 minutes until the glaze is thick and bubbly, then stir in the pecans.
Transfer the mixture to a large platter and serve immediately.