Fold a length of aluminum foil into a triangle shape, and mold the foil to the chicken breast (with the tip of the triangle pointing toward the legs).
Carefully remove the foil and brush the "<g class="gr_ gr_200 gr-alert gr_spell gr_inline_cards gr_disable_anim_appear ContextualSpelling ins-del" id="200" data-gr-id="200">down side</g>" of the foil with canola oil. Set the foil triangle aside, being sure to keep the shape.
When the microwave is done, use tongs to carefully place the onion and apple inside the chicken's cavity.
Sprinkle the ranch packet over the entire surface of the chicken.
Place the chicken in the hot oven and cook at 500 degrees for 20 minutes.
After 20 minutes, remove the chicken from the oven. Turn the oven down to 350 degrees.
Gently place the foil triangle over the chicken breast.