Preheat the oven to 350F (175C)
Heat a pan over medium heat and add a splash of cooking oil of choice (I use olive oil). Once the oil is warm, add in the ground beef and use a wooden spoon to break it apart in the pan. Cook, stirring and breaking apart regularly with the wooden spoon, until just browned and cooked through. Set aside to cool.
Using a large muffin tin, place a tortilla shell inside each cup by pleating the edges. Start by bringing the edges of the tortilla together, bending it enough to allow the center of the shell to be placed in the bottom of the muffin with. Then work the excess by pleating the edges around, creating your boat.
Once you have the done this with all of the tortillas, place into the oven and bake for 10-12 minutes., until browning on the edges. When cooking time is complete, remove from the oven and place to the side. Keep the oven on.
In a medium mixing bowl, mix together the cooked ground beef, enchilada sauce, black beans, jalapenos and salsa. Mix until thoroughly mixed.
Spoon the beef mixture into the tortilla cups, filling to about ¾ full and then top with cheese.
Return boats to the oven and cook for 15 minutes, until heated through and the cheese has melted on top.
Remove from the oven and serve immediately.
Optional: Garnish with cilantro, sour cream, lime wedges, fresh jalapeño slices and chili flakes.