Start with 2 rectangles. Lighter fill color in one, darker color in the other.
Use the Direct Selection Tool to select and move the edge of one of the rectangles.
Repeat the last step with the other rectangle.
Create a rectangle and fill it with a lighter color.
Use the Direction Selection Tool to select a corner of the new rectangle and move the points to the rectangle to match the points on the vertical rectangles.
Make the sides of the new rectangle parallel with each other to create the top.
Make several versions by making the vertical rectangles wider or narrower. The top rectangle can be flatter or steeper to change the look of the tops.
Select each fry and choose Object > Envelop Distort > Make With Warp... Use the Arc Style and set the Bend to Vertical.
Bend the Arc to create difference curves on the fries.
Duplicate and warp the fries to create a stack.
Create a box with a rectangle.
Use the Curvature Tool to click on the bottom center and pull up to create a curve.
Use the Free Transform Tool and select the Perspective Distort to pull the top edges wider.
Create a rectangle with a darker fill.
Use the Direct Selection Tool to select each corner of the rectangle to create the edge of the box.
Copy and flip the edge for the other side.
Use the Curvature Tool to click on the top center and pull down to create a curve.
Place the fries behind the box.
Select some of the fries and change the color by using Edit >Edit Colors > Recolor Artwork. Click on the Edit Tab, lock the colors together in the lower right. Move the paddles left or right to change the color of the selected fries.
Repeat the Recolor artwork on other fries to subtly change the colors to set them apart. Add an oval on the front of the box and you are done!