Combine all ingredients for oatmeal in a small nonstick pot on the stove. Add 3/4 cup of water and mix well. Bring to a boil over medium-high heat, and then reduce to a simmer. Cook for about 9 minutes, stirring often, until somewhat thick and creamy. (It will thicken more upon chilling.) Remove from heat and allow to slightly cool. Transfer to a bowl, cover, and refrigerate until chilled, at least 1 1/2 hours.
Stir oatmeal thoroughly until uniform in texture. Spoon half of the oatmeal into a pint glass, and top with 1/4 cup of sliced strawberries, 1/4 cup of yogurt, and half of the banana slices. Repeat with the remaining oatmeal, strawberries, yogurt, and banana.