Preheat oven to 350 degrees.
Dice the onion and bell pepper. Saute in 1 tsp olive oil until soft. Allow to cool slightly.
In a large bowl, mix together the salmon, sauteed onion and red bell pepper, parsley and dijon. Mix in the beaten egg and 1/2 cup Panko bread crumbs. The egg and bread crumbs should act as a binding agent.
Divide the mixture into 4 parts, pressing each into a 1" thick round cake. Press the cakes into the remaining 1/2 cup Panko bread crumbs on both sides.
Heat a large saute pan, but be careful not to get the pan too hot or the cakes will burn on the outside. Add 1 Tbsp olive oil and using a spatula, put the salmon cakes in the pan. Brown on one side, about 2 minutes. Gently turn over the cakes and place the pan in the oven, about 7 minutes to finish cooking. I like to finish them in the oven so that they do not burn on the outside before they are cooked and hot in the middle.