Cheesy Double Bean Quesadillas with Homemade Avocado Ranch

• 1 cup black beans
• 1 cup cannellini beans
• 2 ounces sharp white Cheddar cheese, freshly grated
• 2 ounces pepperjack cheese, freshly grated
• 4 whole wheat tortillas
• a little butter or olive oil for toasting

avocado ranch

• 1 ripe medium avocado
• 1/3 cup sour cream
• 1/4 cup mayonnaise
• 2 tablespoons freshly chopped parsley
• 2 tablespoons freshly chopped dill
• 1 garlic clove, minced
• 1 teaspoon Worcestershire sauce 
• 1/2 teaspoon white vinegar
• 1/2 teaspoon smoked paprika
• 1/4 teaspoon onion powder
• 1/4 teaspoon salt
• 1/4 teaspoon pepper