Cut the corn tortillas into triangles.
Heat vegetable oil in a frying pan.
Fry the tortillas until golden brown and crispy.
Transfer to a paper towel lined plate and season lightly with salt.
Add Roma tomatoes, guajillo chilies, white onion, garlic, chicken broth, and cumin to a blender.
Blend until completely smooth.
Pour the salsa into a large skillet over medium heat.
Simmer for 10 minutes, stirring occasionally.
Season with salt and black pepper to taste.
Heat olive oil in a separate skillet.
Add red bell pepper, green bell pepper, and white onion.
Cook until softened and lightly caramelized.
Season with salt and black pepper.
Warm the shredded beef in a skillet.
Season with cumin and garlic powder if desired.
Add the fried tortilla chips to the warm guajillo salsa.
Toss gently until evenly coated.
Do not oversoak the chips.
Plate the sauced chips.
Top with shredded beef, sautéed peppers, and onions.
Add queso fresco, Mexican crema, and chopped cilantro.
Top with fried or scrambled eggs if desired.
Add avocado if using.
Serve immediately.