The Punnett square for the cross AABB x AABB would be a 4x4 grid with all homozygous AA BB offspring. You can read our content and also benefit from other resources to make the most delicious punnett square aabb x aabb.
This Punnett square shows the possible genotypes of offspring from a cross between two individuals who are both homozygous dominant for a single gene.
Site:
https://www.khanacademy.org/science/ap-biology/intro-to-ap-biology/ap-intro-to-heredity/a/punnett-squares-practice
When both parents are homozygous dominant for a particular trait, all of the offspring will be homozygous dominant for that trait.
Site:
https://ib.bioninja.com.au/standard-level/topic-2-molecular-biology/24-genetics/punnett-squares-introductory