Brown the ground beef in a large skillet over medium-high heat.
Season the beef with taco seasoning, paprika, garlic powder, onion powder, salt, and black pepper.
Drain excess fat and set the cooked beef aside.
In the same skillet or a separate pan, heat a small amount of oil over medium heat.
Add seasoned shrimp and cook for 2 to 4 minutes until pink and cooked through, then remove from heat.
Arrange tortilla chips evenly on a large baking sheet or oven-safe platter.
Layer the seasoned ground beef and cooked shrimp over the chips.
Sprinkle shredded cheese generously over the toppings.
Melt the cheese under a hot broiler or in a 400 °F (200 °C) oven for 5 to 8 minutes until bubbly.
Remove the nachos from the oven and add diced tomato, chopped red onion, and sliced jalapeños if using.
Garnish with fresh cilantro or parsley.
Drizzle or dollop sour cream on top and serve immediately with lime wedges.