In a large skillet over medium-high heat, add the olive oil. Once hot, add the thinly sliced flank steak and cook for about 4-5 minutes until browned, stirring frequently.
Stir in the bell pepper, onion, and garlic. Cook until the vegetables are softened, about 3-4 minutes.
Add the Worcestershire sauce, smoked paprika, salt, and pepper to the steak and vegetable mixture. Stir well and cook for another minute, then remove from heat.
Take a flour tortilla and place about 1/4 of the steak and vegetable mixture in the center. Top with 1/4 cup of shredded provolone cheese. Fold in the sides and then roll up the tortilla tightly. Repeat with the remaining tortillas and filling.
In a deep skillet or fryer, heat oil to 350°F (175°C). Fry the chimichangas 2-3 at a time, turning occasionally, until golden brown and crispy, about 3-4 minutes. Remove and drain on paper towels.
Cut the chimichangas in half and serve warm with your favorite dipping sauces, such as salsa, guacamole, or sour cream.