Rinse beans under running water and add to a mixing bowl. Rough chop spinach and add to bowl. Add seasoning, sour cream, and cheese to same bowl and mix to combine.
Divide the mixture between the four tortillas. Spread mixture on and then fold tortilla in half.
In a skillet over medium high heat cook quesadillas for 3-4 minutes on each side or until shells are brown and crispy, and insides are warm and melty.