Step 1

Remove seeds from peppers and slice into thin strips.

Step 2

Peel onion and slice into thin slices.

Step 3

In a large pan, heat oil and butter until melted.

Step 4

Add vegetables and cook over high heat, stirring frequently. Cook until vegetables are slightly softened and charred, about 5 minutes.

Step 5

Season with garlic powder, salt and pepper, to taste.

Step 6

To make the quesadillas, evenly divide cheeses among 4 tortillas.

Step 7

Top with fajita veggies and remaining 4 tortillas.

Step 8

Cook quesadillas in a hot frying pan or griddle, until golden brown and cheese is melted, about 2 minutes per side.

Step 9

Cut into wedges and serve with salsa and sour cream, if desired.