Preheat the oven to 350 degrees and line a baking sheet with parchment paper or a silicone baking mat.
Spread oats, almonds, pecans, and pumpkin seeds out on the baking sheet and mix a bit with your fingers to distribute evenly.
Bake at 350 degrees for 20 minutes, stirring after 10 minutes.
Allow to cool completely.
Add dried fruit to the cooled oat, nut, and seed mixture.
Working in batches, pulse mixture in a food processor or blender until uniform in size and fairly smooth.
Store oatmeal mixture in an airtight container up to 1 month.
To serve - Add 1/4 cup oatmeal mixture and 1/2 cup water to a bowl. Microwave 45 seconds - 1 minute. Stir in desired toppings to taste.
For a family-size serving, add 1/4 cup per person and 1/2 cup water per person and heat over medium low heat in a saucepan until oatmeal reaches desired thickness. Stir in desired toppings to taste.