Preheat oven to 375 degrees.
To make the tortilla bowls; Place four small oven safe bowls upside down on a baking sheet. Lightly grease the outside of the bowls. Place a tortilla on top of each bowl, slightly pushing down the sides of the tortillas to make a bowl. Bake in the oven for about 10 minutes until lightly golden and crispy.
For the ground beef; In a large skillet over medium heat, add the ground beef, chili powder, cumin, salt and pepper. Cook for about 7-9 minutes until beef is browned. Stir in lime juice.
While the beef is cooking; Heat black beans in a small saucepan over medium heat for a few minutes until warm. Then, remove from heat.
To assemble taco bowls; Layer spinach leaves on the bottom of each tortilla bowl, followed with ground beef and black beans. Finish them off by evenly distributing your toppings! Top with your favorite hot sauce or salsa. Enjoy!