In my opinion, simple carbs should be ingested pre-post workout meals to cause insulin spikes to aid nutrients into being forced into the muscles when they need it the most. With that said, I developed this shake at home and I loved the taste and energy I get from it.

In a blender add:

2 cups orange juice (50g carbohydrates, 0g protein)
1 banana (25g carbohydrates, 0g protein)
3 tablespoons liquid honey (60g carbohydrates, 0g protein)
1 teaspoon vanilla extract (for extra taste)

total: 135g carbohydrates, 0g protein

all simple carbs, which means quick energy and insulin spike, works awesome for post workout shake when protein is taken as well IMO.