Preheat the oven to 220 degrees Celcius.
Place the block of feta cheese on a piece of aluminium foil. Add chili flakes on top. Fold the edges over the feta cheese to seal the package. Place in the oven and bake for 10-15 minutes. When about 5 minutes remain you can open the package and turn on the broiler to get the feta cheese a bit browned, or just bake it for another 5 minutes.
Place the grapes in an oven safe baking pan and bake in the oven for approximately 10-15 minutes.
Preheat a nonstick pan over medium heat. Add the cut red bell pepper and fry until golden brown and a bit softened, but still a bit crunchy and not fully softened.
Place mixed green leafs on one big or two smaller plates.
Add the baked feta cheese on top (in a whole piece or divided into smaller pieces if prefered) followed by red bell pepper and bakede grapes.
Top with walnuts and agave/honey and serve warm.