How do I fill a Texture2D with pixels and display a sprite with that texture using script?

Hi, I'm trying to make a little pixel transition a-la pokemon battle transition. To do that I need to write pixels per frame to a Texture2D and then set the gameobject's spriterenderer's sprite. My script creates a Texture2D as I want it, I can tell in the editor. But creating a Sprite from that doesn't seem to work.

     void Awake () {
         frame = new Texture2D(size, size);
         
         for (int x = 0; x < size; x++){
             for (int y = 0; y < size; y++){
                 frame.SetPixel(x, y, color); 
             }
         }
         frame.Apply();
     sprit=new Sprite();
         sprit=Sprite.Create(frame, new Rect(0f,0f,size,size), new Vector2(0f,0f));
         gameObject.GetComponent<SpriteRenderer>().sprite=sprit;
     }