Heat the olive oil in a large skillet over medium heat. Add the ground beef and cook until it is browned and no longer pink, breaking it up with a spoon as it cooks.
Stir in the minced garlic, chili powder, cumin, paprika, cayenne, and salt. Cook for one minute until the spices smell fragrant.
Add the sliced red bell pepper, green bell pepper, and onion to the skillet. Cook for 5 to 7 minutes, stirring often, until the vegetables are softened but still have a little crunch.
Warm the flour tortillas in a separate dry skillet or in the microwave. Spoon the beef and vegetable mixture into the tortillas.
Serve right away with lime wedges for squeezing over the top.