Adjust oven rack to lower-middle position and heat oven to 350 degrees. Start by whisking chia seeds and water so they have time to thicken up before you add them. Measure the remaining “meatball” ingredients, including basil, Italian seasonings, and fennel seeds, in a large bowl; whisk thickened chia mixture and add to the bowl. Using hands, mix thoroughly to combine. Divide mixture into approximately twenty-four 2-tablespoon portions, rolling each into a ball.